NLSY79 Appendix 19: SF-12 Health Scale Scoring

The SF-12, which stands for short-form 12-question, is a brief inventory of self-reported mental and physical health. This scale was administered to respondents who had turned 40 since their last interview as part of the age 40+ Health Module, included in the 1998, 2000, 2002, 2004, and 2006 surveys, and in the 50+ Health Module administered in the 2008, 2010, 2012, 2014 and 2016 surveys. The 2018, 2020 and 2022 surveys contain the 60+ Health Module for respondents born in 1963 or 1964, as well as a small number of under-60 respondents in 2022 who had not previously been administered the 50+ module.

Rather than using the twelve questions separately, SF-12 users often create two summary scores:

• PCS-12 or Physical Component Summary (measures physical health): question name H40-SF12_PCS_SCORE, H50-SF12_PCS_SCORE, H60-SF12_PCS_SCORE
• MCS-12 or Mental Component Summary (measures mental health): question name H40-SF12_MCS_SCORE, H50-SF12_MCS_SCORE, H60-SF12_MCS_SCORE

CHRR has received permission to calculate these summary scores for NLSY79 respondents and release the scores with the main data set. Scores are created according to the manual by Ware, Kosinski, and Keller (1995) and are provided on the data set with the question names listed above. However, we are not permitted to release the scoring formula; interested users should visit the QualityMetric website for SF survey information. For users looking at the SF surveys on the Internet, note that the NLSY79 uses version 1, not version 2, of the survey.

In large national surveys of the entire US population, both the PCS-12 and MCS-12 have a mean of 50 and a standard deviation of 10. The interpretation of these two scores is straightforward. NLSY79 respondents with a score above 50 have better health than the typical person in the general U.S. population (age is not held constant). NLSY79 respondents with scores below 50 have worse health than the typical U.S. person. Each one-point difference above or below 50 corresponds to a one-tenth of a standard deviation. For example, a person with a score of 30 is two standard deviations away from the mean.

As Table 1 indicates, the typical NLSY79 respondent self-reports better health than the typical U.S. respondent while in their 40s. This matches the results described in the SF-12 scoring manual, which in addition to population norms reports the norms for U.S. residents in specific age ranges.

NLSY79 respondents in 2008 have higher MCS scores than the overall population and similar PCS scores.

Overall, the SF-12 manual shows higher-than-average physical scores prior to age 55 and rapidly falling scores after that age. Mental scores do not appear to decline with age. Information from the NLSY79 40+, 50+, and 60+ Health Modules appears to match this pattern.

Reference

Ware, John, Mark Kosinski and Susan Keller. 1995. SF-12: How to Score the SF-12 Physical and Mental Health Summary Scales, 2nd edition. Boston: The Health Institute, New England Medical Center.