Table 5.

Selected Results from Estimations of Maternal Postpartum Health Equations With 2-Stage Least Squares (n = 716)

	2SLS Coefficients (P Value)
Independent Variables	Physical Health*1	Mental Health†	Symptoms
Preconception overall health (scaled 1 to 4)	2.35 (<.001)‡	0.79 (.04)‡	−0.69 (<.001)‡
Prenatal moods (1 = yes)	0.10 (.86)	−3.67 (<.001)‡	1.19 (<.001)‡
Cesarean delivery (1 = yes)	−5.96 (<.001)‡	0.60 (.45)	−0.19 (.59)
Infant sex (1 = female)	−0.24 (.64)	−2.27 (<.001)‡	−.03 (.91)
Perceived control (scaled 1 to 4)	0.83 (.03)‡	0.84 (.06)‡	−0.23 (.27)
Social support (scaled 5 to 25)	0.06 (.42)	0.49 (<.001)‡	−0.03 (.42)
Breastfeeding (1 = yes)	−1.32 (.67)	−1.49 (.68)	4.63 (.00)‡
Infant colic (1 = yes)	0.69 (.39)	−1.25 (.17)	0.89 (.04)
Time elapsed since childbirth, d	0.14 (.03)‡	.02 (.77)	−.02 (.44)

2SLS = 2-stage least squares.

* Physical health was measured with the PCS (physical component summary of the SF-12) score.

† Mental health was measured with the MCS (mental component summary of the SF-12) score.

‡ Statistically significant t test on the estimated 2SLS regression coefficient.