Participants completed Form S (self-report version) of the NEO-FFI,9 a 60-item version of the NEO Personality Inventory (NEO PI-R), which operationalizes the FFM. Means and standard deviations for each of the five NEO-FFI personality factors were calculated separately in the men and women. Raw scores were converted into sex-specific standardized T-scores with a mean of 50 and a standard deviation of 10. T-scores were calculated using within-sex published NEO-FFI means and standard deviations that represent population norms published in Table B-4 on page 78 of the NEO PI-R manual.9 The following guide was used to interpret the T-scores; T-scores between 45 and 54 are considered average, scores of 44 or less are low, and scores of 55 or greater are high. The raw scores were also converted into percentiles using the scales provided in Table C-7 on page 85 of the manual.9
