Birth Weight as a Continuous Variable and Birth Weight for Gestational Age Z-score
Nine36,39-41,61,63-66 and three60,62,63 studies reported birth weight as a continuous variable and birth weight for gestational age z-score as outcome measures, respectively. Pooled results for the associations were not statistically significant (women in the top tertile compared with the bottom tertile. For birth weight, beta: -7.8; 95 CI: -56.0, 40.5; I2 = 79%; P-heterogeneity <0.01; Figure S6. For birth weight for gestational age z-score, beta: 0.0; 95 CI: -0.1, 0.2; I2 = 74%; P-heterogeneity =0.02; Figure S7.). All studies were of high quality (NOS score ≥7) (Table S2).