Table 4.

Means and standard deviations of salivary cortisol, perceived stress, and maternal mood levels at 18 months postpartum, by group condition.

	CBSM n = 24	UC n = 22
	M (SD)	M (SD)
18-month postpartum salivary cortisol
Maternal cortisol (log scores)
Morning cortisol	0.98 (± 0.32)	1.23 (± 0.58)
Evening cortisol	0.20 (± 0.52)	0.40 (± 0.45)
Average cortisol†	0.60 (± 0.36)	0.81 (± 0.43)*
Cortisol slope	0.79 (± 0.47)	0.83 (± 0.56)
Child cortisol (log scores)
Morning cortisol	1.00 (± 0.49)	1.18 (± 0.31)
Evening cortisol	0.53 (± 0.61)	0.58 (± 0.72)
Average cortisol	0.76 (± 0.50)	0.82 (± 0.61)
Cortisol slope	0.45 (± 0.48)	0.50 (± 0.54)
Collection time [hour:minutes (minutes)]
Mother morning cortisol collection time	8:39 (± 1:05)	8:21 (± 1:05)
Mother evening cortisol collection time	8:15 (± 0:35)	8:11 (± 0:38)
Child morning cortisol collection time	8:58 (± 0:59)	8:22 (± 1:03)
Child evening cortisol collection time	8:16 (± 0:21)	8:12 (± 0:38)
18-month postpartum stress and mood measures
Maternal stress rating
Morning stress rating	32.2 (± 19.6)	33.0 (± 18.7)
Evening stress rating	46.3 (± 21.1)	41.1 (± 21.1)
Average stress rating	39.7 (± 17.7)	37.5 (± 18.1)
Child stress rating
Morning stress rating	20.5 (± 20.1)	23.5 (± 19.0)
Evening stress rating	40.0 (± 27.1)	26.8 (± 22.4)
Average stress rating	30.3 (± 20.7)	25.3 (± 18.2)
Depression
CES-D	15.4 (± 10.5)	15.8 (± 10.5)
Affect
Positive affect	2.7 (± 0.6)	2.5 (± 0.8)
Negative affect	1.7 (± 0.7)	1.7 (± 0.8)

Note. Independent samples t tests were conducted for all between group analyses

^*p < .05;

^**p < .01;

^***p < .001

^†Group means were significant after adjusting for past history of depression and annual family income (p < .01)