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Original Research ARTICLE

Front. Psychol., 13 July 2011 | https://doi.org/10.3389/fpsyg.2011.00158

Measuring personality in wave I of the national longitudinal study of adolescent health

  • 1 Center for Doctoral Studies in Educational Leadership, Lamar University, Beaumont, TX, USA
  • 2 Department of Educational Psychology, Baylor University, Waco, TX, USA

The researchers sought to develop a personality measure from items in Wave I of the National Longitudinal Study of Adolescent Health. The study found 13 items from three dimensions of personality (neuroticism, extroversion, and conscientiousness), and then examined the factor structure and internal consistency of each of the three dimensions. Within each personality dimension, the items showed a unidimensional factor structure and internal consistency estimates of the summed similar to scores from NEO Personality Inventories. The results can be used to further examine how child/adolescent personality is related to multiple mental and physical health outcomes in the Add Health database.

Introduction

Personality is a meaningful predictor of important life outcomes such as occupation selection (Filer, 1986), job performance (Ones et al., 1993; Judge et al., 1999), and academic success (Poropat, 2009). Moreover, personality factors have been found to be related to various health outcomes (Deary et al., 2010), such as mortality (Schwartz et al., 1995), accident involvement (Clarke and Robertson, 2005; Sümer et al., 2005), health behaviors and outcomes (Hampson et al., 2006; Roberts et al., 2007), and even health knowledge (Beier and Ackerman, 2003). Some even contend that most psychology-related variables used in studying health (e.g., optimism, hopelessness, self-efficacy, locus of control) simply reflect different aspects of personality (Marshall et al., 1994).

There are multiple conceptions of personality structure and the best way to measure the varying arrangements (Stankov et al., 1995), but many in the field have reached a working consensus that there are five broad, super-ordinate factors/domains from which a wide variety of personality-related behaviors and constellations can be classified (Digman, 1990; McCrae and Costa, 2008), commonly referred to as the Five Factor Model (FFM) or the “Big Five” (Digman, 1990; McCrae and Costa, 1997, 2008). The five factors are: Openness to Experience (O), Conscientiousness (C), Extraversion (E), Agreeableness (A), and Neuroticism (N; see Table 1 for descriptions). Variability in these five factors appears to be strongly influenced by genetic factors (Loehlin, 1992), which may explain the emergence of these same personality factors across multiple cultures (McCrae and Costa, 1997; McCrae and Allik, 2002), as well as the stability in structure from childhood and adolescence to adulthood (Costa and McCrae, 1994; Caspi and Roberts, 2001), and throughout adulthood (McCrae and Costa, 2003).

TABLE 1
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Table 1 . Description of the five-factor model of personality.

Five Factor Model and Health Outcomes

Although the interface of personality and health outcomes is an under-researched area (Booth-Kewley and Vickers, 1994), the information currently available is relatively consistent in showing an adverse relationship between high N and mental and physical well being (Goodwin and Friedman, 2006), whereas high C tends to be related to more positive mental and physical health outcomes (Smith, 2006); moreover, these relationships tend to be relatively stable across the lifespan (Goodwin and Friedman, 2006; Martin et al., 2007; Kern and Friedman, 2008). E has shown a more equivocal relationship to health outcomes, showing both positive and negative health implications, while much less attention has been paid to how O and A have relate to mental (Kern and Friedman, 2008) or physical health (Booth-Kewley and Vickers, 1994).

The reason for the personality–health relationship is still not well understood, but there is some indication that there are at least three different, although not mutually exclusive, possible mechanisms for the relationship (Caspi and Roberts, 2001). First, personality differences may just be behavioral manifestations of differences in underlying pathogenesis. Second, since personality differences are associated with health-promoting or health-damaging behaviors, the personality–health relationship might be attributed to the fact that people with certain personality constellations tend to engage in better/worse health-promotion. Third, personality differences may be more of a reflection of how people react to mental and/or physical illness, such as coping behaviors, modulation of distress, and treatment adherence. A major caveat in these studies, however, is that historically they have been confined to samples of adults. Thus Caspi et al. (2005) write that researchers in this area need to “turn their attention to earlier periods in development in order to understand enduring research and public health puzzles” (p. 475).

Current Study

Given the potential importance of personality in understanding differences in health outcomes, it appears imperative that studies of child and adolescent physical and mental health include such measures. To that end, this study investigated the measurement of personality in Wave I of the National Longitudinal Study of Adolescent Health (Add Health; (Udry and Bearman, 1998). The Add Health study is a comprehensive examination of child/adolescent health, designed to measure numerous variables related to physical and mental well being in adolescence. Originally designed to investigate how social contexts (e.g., family, friends, schools, neighborhoods) and individual characteristics influence adolescent health and risk behaviors, the Add Health data includes variables related to physical and mental health; interpersonal relationships and sexual behaviors; education; delinquency and violence; adolescent involvement in adult roles; various genetic and biological measures of disease presence and processes; as well as a variety of measures about the environments in which the participants live, go to school, and work. Wave I of the study began collecting data during the 1994–1995 school year, when the participants were in grades 7–12, and the most recent wave of data (Wave IV) was collected in 2008 when the participants were between the ages of 24–32 years old. The most recent phases of the study examined the effects of the various contexts and health during the transition from adolescence to early adulthood.

There were no specific personality instruments used as part of the variables collected during the first three waves of data collection. However, a portion of the questions from Wave I of the study’s questionnaires could possibly be used to develop a personality measure. To date, no study has examined these questions to determine: (a) if the survey questions from Wave I had a lexical relationship to questions from other measures specifically designed to measure personality? (b) If so, could any of the questions be aggregated to form a scale? (c) If questions could be aggregated, what is the internal consistency of such scales? and (d) Do these scales actually measure personality factors? Thus, this study was designed to answer these four questions with the hopes that if dimensions of personality can be measured in the Add Health data, they can then be used to investigate the relationship between child/adolescent personality traits and health outcomes both proximally (in childhood/adolescence) and distally (early adulthood).

Materials and Methods

Study Design

The National Longitudinal Study of Adolescent Health (Add Health) was initiated in 1994 under a grant from the National Institute of Child Health and Human Development with co-funding from 17 other federal agencies. Researchers in this study collected data in multiple waves through the use of in-home, in-school, and school administrator questionnaires. It was designed to be the largest, most comprehensive survey of adolescents ever undertaken to study the health-related behaviors of adolescents (grades 7 through 12) and their outcomes in adulthood. Moreover, the Add Health sample has multiple sub-samples such as participants who are twins, adoptees, and siblings, as well as information on the participants’ family and social networks, all of which can be used to help understand genetic and environmental influences on physical and mental health practices and outcomes (Duncan et al., 2001).

Sample

The sample for this study came from all the Add Health participants who completed the Wave I In-Home and In-School questionnaires (n = 20,745). Fifty percent of the respondents were female and their ages ranged from 11.42 years) to 21.42 years (mean 16.16 years, SD = 1.72 years). Of the 20,745 respondents, 12,747 (61.45%) self-reported being Caucasian, 4,807 (23.17%) were African-American, 1,584 (7.64%) were Asian-American, 740 (3.57%) were American Indian, with the remaining participants not identifying their race. In addition, 3525 (16.99%) of the respondents self-reported having Hispanic ethnicity.

Instrument development and psychometric analysis

To develop measures of personality traits from the Add Health Wave I survey items, we combined the lexical (John et al., 1988) and factor analytic (Floyd and Widaman, 1995) approaches. Both methods have a long history in the development of personality scales (Eysenck and Eysenck, 1985; Barenbaum and Winter, 2008) and both approaches have made contributions to the measurement and understanding personality (Lohman and Rocklin, 1995).

Lexical approach. First, we selected a criterion instrument that was designed to measure the FFM personality domains and subsequently made a list of the all the item stems in each of the five domains. The criterion we used was the International Personality Item Pool (IPIP; (Goldberg et al., 2006) version of the NEO Personality Inventory-Revised (NEO-PI-R; (Costa and McCrae, 1992a). The IPIP NEO-PI-R was selected because (a) it was designed to measure multiple aspects of each factor of the of the FFM; (b) is in the public domain; (c) it has a statement-based format that matches many of the items from the Add Health surveys; (d) the NEO instruments have been used in a wide usage of clinical and research settings (Costa and McCrae, 1992a,b); and (e) the NEO-PI-R has been shown to work well in adolescent samples (De Fruyt et al., 2000). Second, we searched the Add Health Wave I In-Home and In-School questionnaires for items that lexically or conceptually matched statements from the IPIP NEO-PI-R1.

Factor analytic approach. The purpose of the factor analytic approach was twofold. The first purpose was to assess the dimensionality of the items found in the lexical approach, while the second was to examine how each of the found items measured its respective personality domain. McCrae and Costa (2004; cf. McCrae et al., 1996) recommend assessing dimensionality of NEO items via principal components analysis (PCA). Other methodologists have criticized using PCA because it was designed for use with continuous variables, but items on personality tests are typically categorical (Waller et al., 1996; Panter et al., 1997). Neglecting the continuous-variable assumption of PCA, and other traditional exploratory factor analytic (EFA) techniques, can lead to factor extraction problems because the item thresholds (difficulties) are not taken into account (Bernstein and Teng, 1989). Consequently, we assessed item dimensionality using item-level exploratory factor analysis (IL-EFA), which accounts for item thresholds by using polychoric correlations estimated via a robust weighted least squares estimator (Flora and Curran, 2004) to measure the relationship among the items (Muthén and Kaplan, 1992).

Once we determined the dimensionality of the items, we then conducted an item-response theory/confirmatory factor analysis (IRT/CFA; (Brown, 2006; Kamata and Bauer, 2008) to examine how well each of the items measured their respective personality factors/domains. For the IRT/CFA analysis, we used a robust maximum likelihood estimator. As fit measures are not yet well developed for IRT/CFA with item-level data, and because our sample size was so large, we used the IRT/CFA estimates as a cross-validation of the EFA results (Bandalos, 1993), although we did not expect there to be large differences (Kay, 2004). Consequently, we randomly split the participants into two groups and conducted the EFA on the first group and the IRT/CFA on the second group.

To determine the number of factors to extract in the IL-EFA, we used three criteria. First, best practices in EFA (Osborne et al., 2008) suggest using more traditional techniques (e.g., minimum average partial test, MAP; (Velicer et al., 2000) to examine the number of factor to extract. Consequently, we used the MAP test with the polychoric correlations as input. To conduct the MAP test, we used the SPSS syntax provided by O’Connor (2000), which uses the original correlations (i.e., the polychoric correlations) in all the MAP test steps.

Second, we examined the IL-EFA fit statistics after extracting one to five factors. The fit statistics we used were the root mean square error of approximation (RMSEA), comparative fit index (CFI), and the standardized root mean square residual (SRMR). These indexes were chosen as they represent both absolute and relative fit indices, and they tend to perform well in simulation studies (Marsh et al., 2005). While it is tenuous to use absolute cut-off values for fit indices, usually factor models tend to do an adequate job representing the data when: (a) the RMSEA value is less than 0.08 (Chen et al., 2008); (b) the CFI value is greater than 0.96 (Yu and Muthén, 2002); and (c) the SRMR value is less than 0.08 (Sivo et al., 2006). Because fit indices tend to get better in EFA as more factors are extracted, we looked for the most parsimonious number of factors that would produce adequate values that best fit the data.

For the third criterion, we examined pattern coefficients from the various extractions to gage factor interpretability. While this is more subjective than the other methods we employed, it is still one of the most important steps in determining the number of factors to extract (Gorsuch, 1992).

Internal consistency. For each personality factor/domain we found from the previous steps, we summed the items scores within a domain and assessed the internal consistency of the scores using all the respondents in the sample. We assessed internal consistency using both Cronbach’s alpha and McDonald’s omega (Zinbarg et al., 2005).

Predictive validity evidence. In Wave IV (2008) of the Add Health design, the In-Home instrument purposely collected personality data based on the FFM. For each factor, the questionnaire included four questions. There were 14,800 participants who had data at both Wave I (1994–1995) and Wave IV (2008). We correlated the factor scores (using IRT/CFA) collected from the Wave I personality measure with the factor scores (again, using IRT/CFA) from the Wave IV personality measurement to examine the predictive validity of the Wave I scales.

Results

Lexical Method

Searching the Wave I questionnaires yielded 21 items that appeared to measure neuroticism (N) (8 items), extroversion (E) (7 items), and conscientiousness (C) (6 items).

Factor Analytic Methods

There were missing responses for the 21 items ranging from less than 1 to 34.50% of the sample, with 24 of the respondents having no response recorded for any of the items. Consequently, the subsequent factor analyses were conducted using the 20, 721 participants with at least one item score (half being used for the EFA analysis, and the other half being used for the CFA/IRT analysis). For the EFA, missing data was handled using pairwise present method (Kaplan, 2009), whereas the CFA/IRT analysis used the full information maximum likelihood estimator (Enders and Bandalos, 2001) with the delta paramaterization and logit link. All factor analyses were conducted in Mplus (Muthén and Muthén, 2010).

For the IL-EFA, the RMSEA values indicated that four factors should be extracted, but the CFI, SRMR and MAP test indicated that only three factors should be extracted. When we examined the pattern coefficients, we found five items across both the three- and four-factor extractions that measured little in common with the other items (i.e., all pattern coefficients <0.30 and all communalities <0.14). In addition, there were three additional items that had moderate pattern coefficients (between 0.48 and 0.58) on the four-factor solution and low coefficients (<0.30) on the three-factor solution, but the content of these items did not appear to overlap with each other. Consequently, we removed these 8 items and conducted an additional IL-EFA on the remaining 13 items. The values of the IL-EFA criterion measures all converged to indicate that a three-factor solution bet fit the data. The results from both IL-EFAs are given in Table 2.

TABLE 2
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Table 2 . Results from the exploratory factor analysis.

The pattern coefficients for the IL-EFA are given in the first part of Table 3. Each item had a large coefficient (>|0.69|) in only one domain and small coefficients (<|0.19|) for the other two domains. Thus, while the final 13 items are measuring three dimensions, each item appears to only measure one factor (i.e., the three factors the items are measuring appear to be unidimensional). The pattern coefficients from IRT/CFA are given in second part of Table 3 and, as expected, are very similar to those from the IL-EFA, with the maximum absolute difference being 0.06.

TABLE 3
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Table 3 . Factor analysis pattern coefficients.

Table 4 shows the final 13 items, similar items from the IPIP NEO-PI-R, and where they can be located in the Add Health questionnaires and database. The results from Tables 3 and 4 indicate that the 13 items used in this study are similar in content to the IPIP NEO-PI-R items that measure C, E, and N.

TABLE 4
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Table 4 . Final personality items from Wave I of the Add Health Data.

Internal Consistency

The first two rows of data in Table 5 show the internal consistency estimates for the C, E, and N personality scales we developed from Wave I of the Add Health data. While the values are similar to internal consistency estimates typically found for scores on personality questionnaires (Kline, 1998), these estimates can be put into a better context by comparing them to the results of a recent meta-analysis (Caruso, 2000) of various NEO instruments’ score reliability. The last two rows on data in Table 5 contain the average coefficient alpha values reported for all NEO instruments as well as the values for the shortened version of the NEO-PI-R, the NEO-Five Factor Inventory (NEO-FFI). Across the N, E, and C domains, the internal consistency estimates for the Add Health personality scales are almost identical to the averages from the NEO-FFI (largest difference: 0.04) and are very close to averages for all the NEO instruments (largest difference:0.07), which is remarkable given that the current scales have from 3 to 6 items, whereas the NEO-PI-R has 60 items for each scale and the NEO-FFI has 12 items for each scale.

TABLE 5
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Table 5 . Reliability estimates for Add Heath Wave I personality scores.

Predictive Validity

The results from the analysis of the personality data gathered in Wave IV (2008) of the Add Health study is given in Table 6. As the table shows, all the Wave IV items had relatively high pattern coefficients on their intended factor. More importantly for the study of the Wave I (1994–1995) items is that the correlations between the Wave I and Wave IV factors, although modest, are in the expected directions.

TABLE 6
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Table 6 . Wave IV results.

Discussion

The purpose of this study was to determine how to best measure personality from existing data in a longitudinal dataset that does not utilize a specific personality instrument as part of its collected data. Using survey questions from Wave I of the Longitudinal Study of Adolescent Health (Add Health), we sought to determine (a) if the survey questions from Wave I had a lexical relationship to questions from other measures specifically designed to measure personality? (b) if so, could any of the questions be aggregated to form a scale? (c) if questions could be aggregated, what is the internal consistency of such scales? and (d) do these scales actually measure personality factors?

We compared the questions used in Wave I of the Add Health study with items from the IPIP (Goldberg et al., 2006) version of the NEO-PI-R (Costa and McCrae, 1992a). Then we subjected those items to an item-level factor analyses to determine what items to keep, as well as the dimensionality of the domains the items measured. We found that there were 13 items that measured neuroticism (N), extroversion (E), and conscientiousness (C) – three of the major super-ordinate dimensions of personality. Although there were only a few items in each of these three personality domains, the factor structure of the items indicates they each measure only one construct (i.e., domain scores are unidimensional) and the N, E, and C scores appear to have internal consistency estimates (alpha coefficients ranging from 0.76 to 0.86) similar to NEO Personality instruments, which measure the N, E, and C constructs with 3- to 10-times as many items. Furthermore, the factors from Wave I had a modest correlation in the expected direction with the factors from Wave IV. There are a few possible reasons for the weak correlations between the two waves of data collection, such as the amount of time between data collection of Wave I and Wave IV, personality being measured in early adolescence, or the possibility of poor measurement of the construct in Wave IV.

Conclusion

The Add Health study uses longitudinal survey data, combined with contextual data, to study how the relationship of social environments and behaviors in adolescence influence health and achievement outcomes. The data is accessible in both public and restricted use formats. The public-use data is free for downloading from two sources, but is limited in the variables that can be accessed. Specific instructions for accessing the Add Health data, as well as the variables included in the public and restricted use files, are found at http://www.cpc.unc.edu/projects/addhealth/data. Having measures of personality in the Add Health data provide opportunity for the investigation of child/adolescent personality to a myriad of physical and mental health outcomes, both proximally (in childhood/adolescence) and distally (in adulthood). Specifically, neuroticism, extroversion, and conscientiousness could be included in models investigating physical and psychological health outcomes such as depression, substance abuse, and pregnancy in adolescence and early adulthood; data that is included in the Add Health study.

Furthermore, existing personality research suggests that various personality traits tend to moderate or mediate the relationship of several mental health outcomes, such as depression (Ayotte et al., 2009) and eating disorders (Eggert et al., 2007) and the interactive relationship of specific traits, such as extroversion and neuroticism, are related to overall well being (Lynn and Steel, 2006). Having measures of personality in a large, longitudinal dataset, such as the Add Health dataset, allows researchers to investigate the nature of the relationship (mediating, moderating, or interactive) of personality traits to other variables associated with various mental and physical health outcomes.

This study also provides a method for creating measures of personality from other large-scale studies, potentially allowing researchers to investigate personality-related outcomes within the context of other large datasets. The ability to create personality measures within other large-scale data sets allows researchers to further investigate the relationship of personality traits to other mental and physical health outcomes not included in the Add Health study, but nonetheless important in serving mental and physical health needs of children and adolescents that have potential ramifications throughout the lifespan.

Despite the size of the sample and strength of methods employed, the current study is not without limitations. One limitation is the inability to directly compare how the scores from the personality factors extracted in this study relate to scores of other standardized measures of personality. Another limitation is that because the Add Health study did not use a specific measure of personality, we could only extract three of the five major personality factors, and the factors we could extract are made up of only limited number of items.

Author’s Notes

A. Alexander Beaujean was supported by Award Number R03HD058464 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development. The content is solely the responsibility of the authors and does not necessarily represent the official views of the Eunice Kennedy Shriver National Institute of Child Health and Human Development or the National Institutes of Health.

This research uses data from Add Health, a program project designed by J. Richard Udry, Peter S. Bearman, and Kathleen Mullan Harris, and funded by a grant P01-HD31921 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development, with cooperative funding from 17 other agencies. Special acknowledgment is due Ronald R. Rindfuss and Barbara Entwisle for assistance in the original design. Persons interested in obtaining data files from Add Health should contact Add Health, Carolina Population Center, 123 W. Franklin Street, Chapel Hill, NC 27516-2524 (addhealth@unc.edu). No direct support was received from grant P01-HD31921 for this analysis.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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Keywords: personality, measurement, adolescent health, cognitive epidemiology

Citation: Young JK and Beaujean AA (2011) Measuring personality in wave I of the national longitudinal study of adolescent health. Front. Psychology 2:158. doi: 10.3389/fpsyg.2011.00158

Received: 08 February 2011; Paper pending published: 26 March 2011;
Accepted: 23 June 2011; Published online: 13 July 2011

Edited by:

Boaz Shulruf, University of Auckland, New Zealand

Reviewed by:

Jennifer Koran, Southern Illinois University, USA
Andrew Jones, American Board of Surgery, USA

Copyright: © 2011 Young and Beaujean. This is an open-access article subject to a non-exclusive license between the authors and Frontiers Media SA, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and other Frontiers conditions are complied with.

*Correspondence: J. Kenneth Young, Center for Doctoral Studies in Educational Leadership, Lamar University, Beaumont 77710, TX, USA. e-mail: ken.young@lamar.edu