TABLE 1.

Characteristics of the study sample and descriptive statistics for study variables (n = 85)

Variable	N	%/M	SD
Demographic variables
Household income as %FPL	85	300.98	310.16
Maternal education (years completed)	84	12.98	3.32
Child sex (n/% female)	47	55.29%
Child age at first early childhood visit (years)	76	3.77	0.38
Child age at second early childhood visit (years)	65	5.04	0.43
Child race/ethnicity
African American or Black	10	11.76%
White or Caucasian	25	29.41%
Latino or Hispanic	42	49.41%
Multiracial	8	9.41%
Study site
Lake County, IL	67	78.82%
North Carolina	8	9.41%
Washington, DC	10	11.76%
Maternal prepregnancy stress and mental health variables
PTSD symptoms	64	24.59	9.02
PSS Score	85	12.48	5.15
EPDS Score	85	4.84	4.33
Cortisol variables—Averages for 3 sampling days after first study visit
Sleep duration	202	9.75	1.37
Wake time	203	8.20	1.39
Cortisol: awakening (nmol/L)	207	8.82	9.73
Cortisol: 30 min after awakening (nmol/L)	202	9.65	10.34
Cortisol: bedtime (nmol/L)	198	3.65	10.68
Cortisol awakening response	202	0.04	0.27
Diurnal slope	193	−0.41	0.60
Cortisol variables—Averages for 3 sampling days after second study visit
Sleep duration	174	9.93	1.40
Wake time	173	7.59	1.19
Cortisol: awakening (nmol/L)	185	6.62	4.74
Cortisol: 30 min after awakening (nmol/L)	178	7.54	6.29
Cortisol: bedtime (nmol/L)	178	1.79	3.69
Cortisol awakening response	178	0.03	0.18
Diurnal slope	169	−0.38	0.36

Abbreviations: PTSD, posttraumatic stress disorder; PSS, Perceived Stress Scale; EPDS, Edinburgh Postnatal Depression Scale. Descriptive statistics for cortisol variables at first and second study visit are provided for individual sampling days. 81 children provided up to three days of samples at the first study visit, and 70 children provided up to three days samples at the second study visit.