Table 2.

Important Differences Between Women by 5-Week Interview Status

	Mean No. (SD)
Variables	Full Interview n = 716	Mini Interview n = 30	No Interview n = 71	Significance of F Test Using ANOVA or t Test*P Value
Continuous
Maternal age, y	29.9 (5.30)	27.2 (5.8)	27.9 (6.1)	.001
Annual household income, $	71,741 (38,018)	51,930 (27,122)	66,262 (39,902)	.012
Days from childbirth until 5-wk interview	33.42 (6.32)	42.73 (11.3)	N/A	<.001
Physical health (PCS) score	51.4 (7.2)	49.4 (11.3)	N/A	Not significant*
Mental health (MCS) score	49.6 (7.9)	49.4 (7.6)	N/A	Not significant*

	No. (%)			Significance of χ2
PCS = physical component summary of the SF-1233; MCS = mental component summary of the SF-1233; N/A denotes that information is missing for enrolled subjects given their interview status at 5 weeks postpartum.
Note: Variables not significantly different between groups included the proportion of women who smoked while pregnant, were primiparous; experienced prenatal mood problems, labor and delivery complications, cesarean deliveries; and reported prenatal prenatal job satisfaction. There were no differences between groups on the mean levels of perceived control and preconception overall health and prenatal job stress. The proportion of women on leave vs returned to work at 5 weeks did not vary between women completing the full interview and those completing the mini interview because of time constraints.
* t Test used to evaluate the differences in mean PCS and MCS scores between women completing the full interview and those completing the mini interview.
Discrete
White	615 (86)	13 (43)	53 (75)	<.001
Married	531 (74)	14 (47)	38 (54)	<.001
College educated	331 (46)	7 (23)	16 (23)	<.001
One or more chronic health problems	116 (16)	10 (33)	15 (21)	.040