Table 2. Measures, Reliability Indices, and Measurement Timepoints.

Construct or Variable	Instrument	α* k IRR		Timepoint‡
Screening for Depressive	Center for Epidemiological Studies Depression Scale
Symptom Severity	(CES-D; Radloff, 1977)	α = .90
	Outcomes		T1	T2	T3	T4
Depressive Symptom Severity	Hamilton Rating Scale for Depression (Hamilton, 1960)	α = .75	X	X	X	X
Major Depressive Episode	Structured Clinical Interview for DSM-IV (SCID; First, Spitzer, Gibbon, & Williams, 2001)	IRR>.85	X	—	—	X
Maternal Positive Involvement, Negative Control, Developmental	Maternal-Child Observation (MCO; Videotaped; Holditch-Davis et al., 2007)	k = .66-.95	X	X	—	X
Stimulation	HOME Inventory (Observer-rated; Caldwell & Bradley, 1980)	IRR > .90	X	X	—	X
Perceived Stress	Everyday Stressors Index (ESI; Hall & Farel, 1988)	α = .83	X	X	X	X
Satisfaction with Social Support	Interpersonal Inventory (IPRI; Tilden, Nelson, & May, 1990)	α = .90	X	X	X	X
	Mediators
Self-Efficacy	General Self-Efficacy Scale (GSE: Schwarzer & Born, 1997)	α = .89	X	X	X	X
Social Support Seeking	Social Support Seeking Inventory (SSSI; Greenglass, Fiksenbaum, & Burke, 1996)
	Moderators
Maternal Characteristics	Family Information Interview (Beeber et al., 2007)	α = .84	X	—	—	X
Maternal Health-Related Function	MOS Health Form (SF-12; Hurst, Ruta, & Kind, 1998)		X	X	X	X
Maternal Burden Factors			X	—	—	X
	Family Information Interview (FII)

^*Notes. Reliability indices for this study; α = Cronbach’s alpha; IRR = interrater reliability; k = Kappa;

^‡Timepoint: T1 = baseline, T2 = 14 weeks, T3 = 22 weeks, T4 = 26 weeks