highly significantp = 0.005
An analysis of effect modification also showed that the magnitudes of effect between iron deficiency and LBW were highly significant and greater in primigravidae (LBW aOR 0.26; 95% CI 0.10, 0.66; p = 0.005) than in multigravidae (LBW aOR 0.42; 95% CI 0.15, 1.20; p = 0.105; Table 2 ).