Table 4.

Supplementation Effects Stratified by Baseline IDA Status

	Non-IDA				IDA
	N	Iron-FA	Zinc	Interaction	N	Iron-FA	Zinc	Interaction
Pemba Islanda
Number of naps	209	0.1 (0.0 to 0.2)c	−0.01 (−0.1 to 0.1)	—	248	−0.03 (−0.1 to 0.1)	−0.1 (−0.2 to 0.01)*	—
Nap duration	190	−0.3 (−0.2 to 0.1)	0.01 (−0.2 to 0.2)	—	236	−0.01 (−0.2 to 0.2)	0.02 (−0.2 to 0.2)	—
Nighttime sleep	251	1.6 (−0.1 to 3.0)*	1.3 (0.01 to 2.6)*	−2.5 (−4.4 to −0.5)*	270	0.6 (0.3 to 1.6)*	−0.2 (−1.2 to 0.8)	—
Number wakings	257	0.1 (−0.4 to 0.6)	−0.4 (−0.9 to 0.1)		278	−0.3 (−0.8 to 0.2)	−0.1 (−0.7 to 0.3)	—
Total sleep	183	1.2 (−0.6 to 2.9)	1.7 (0.1 to 3.3)*	−3.2 (−5.5 to −0.7)*	227	0.7 (−0.4 to 1.7)	−0.1 (−1.2 to 0.9)	—
Nepalb
Number of naps	241	0.1 (−0.02 to 0.2)	0.005 (−0.1 to 0.1)	—	113	0.02 (−0.1 to 0.1)	0.02 (−0.1 to 0.1)	—
Nap duration	239	0.2 (−0.1 to 0.4)	0.1 (−0.1 to 0.3)	—	113	−0.2 (−0.4 to 0.03)	−0.3 (−0.6 to −0.04)*	0.6 (0.2 to 1.0)**
Nighttime sleep	280	0.3 (0.01 to 0.5)*	0.1 (−0.2 to 0.3)	—	135	0.5 (0.1 to 0.9)*	0.3 (−0.1 to 0.6)	—
Number wakings	304	0.002 (−0.2 to 0.3)	−0.1 (−0.3 to 0.2)	—	142	0.2 (−0.1 to −0.6)	0.01 (−0.3 to 0.3)	—
Total sleep	219	0.4 (0.01 to 0.7)	0.2 (−0.1 to 0.6)	—	108	0.4 (−0.02 to 0.8)	0.5 (0.1 to 0.9)*	—

FA, folic acid, IDA, iron deficiency anemia; ZPP, zinc protoporphyrin.

^aAdjusted for baseline sleep, and breastfeeding.

^bAdjusted for sex, hemoglobin, ZPP, stunting, and caste/religion; adjusted for cluster randomization; robust estimates of variance.

^cValues given as β (95% CI).

^*p < .05,

^**p < .01.