Table 2.

 Meta-regression analyses (univariate analysis*) of all cause infant mortality after neonatal vitamin A supplementation

Study† characteristic	Ratio of RRs‡ (95% CI); I2§	P value
Attrition (≥10% v <10%)	1.00 (0.40 to 2.51); 0.61	0.990
Follow-up age (months) (>6 v ≤6)	1.23 (0.71 to 2.15); 0.53	0.351
Maternal postpartum vitamin A supplementation (≥30% mothers) (yes v no)	1.18 (0.56 to 2.47); 0.60	0.576
No of vitamin A doses received by infant (multiple v single)	0.80 (0.43 to 1.51); 0.51	0.387
Maternal night blindness (≥5% v <5%)	0.67 (0.05 to 9.01); 0.00	0.300

*Multivariate analysis not performed because no study characteristic was significant predictor of response on univariate analysis and number of trials was small.

†N=6 except for maternal night blindness (n=3).

‡For binary variables, estimate of effect size is ratio of relative risks for mortality during infancy (treated/control) in two groups.

§Represents proportion of residual variation caused by heterogeneity.