Table 2.

Distribution of mean log diurnal cortisol by baseline covariates (n=916)

Covariates	N (%)	Mean Log Diurnal Cortisol (nmol/L) Mean (SD) or Correlation
Baseline Variables
Age (Mean (SD))	25.33 (1.6)	0.00
Sex
Female	640 (69.9)	1.85 (0.4)
Male	276 (30.1)	1.69 (0.4)
Race
White	843 (92.3)	1.79 (0.4)
Non-White	70 (7.7)	1.91 (0.5)
Sexual Orientation
Heterosexual	623 (68.6)	1.80 (0.3)
Not heterosexual	285 (31.4)	1.79 (0.4)
Father’s Education
Some High School or HS Grad	118 (13.8)	1.78 (0.4)
2-year College	148 (17.3)	1.82 (0.4)
4-year College or Grad School	588 (68.9)	1.81 (0.4)
BMI (Mean (SD))	24.68 (4.9)	−0.05
Day Saliva Samples are Obtained
Hormonal Contraception
Any hormonal contraception use	327 (35.7)	1.90 (0.3)
No hormonal contraception use	588 (64.3)	1.75 (0.4)
Sleep Duration, hours (Mean (SD))	7.50 (1.3)	−0.08
Waking Time, hours past midnight (Mean (SD))	7.57 (1.6)	−0.08
Smoking
Any smoking	34 (3.7)	1.98 (0.5)
No smoking	881 (96.3)	1.79 (0.4)
Vigorous Physical Activity
Any physical activity	306 (33.9)	1.86 (0.3)
No physical activity	596 (66.1)	1.77 (0.4)
Time to saliva sample, months (Mean (SD))	25.23 (9.0)	0.04

Time to saliva sample is the time in months between baseline (in 2010) and saliva assessment for cortisol (between 2011 and 2014).

N (%) are presented for categorical covariates, Mean (SD) are presented for continuous covariates. Mean (SD) of mean log-transformed diurnal cortisol is presented for each level of categorical covariates, correlations between cortisol and continuous covariates are presented.

p<.05 are bolded, p<.10 are italicized; p-values refer to T-tests for binary categorical covariates and mean log cortisol, F-statistics for categorical covariates (> 2 categories) and mean log cortisol, and Pearson correlations for continuous covariates and mean log cortisol.