Association between maternal iron supplementation and newborn birth weight: a quantile regression analysis

Table 3 QR and OLS results for accessing the association between iron supplementation and birth weight in different percentiles

Quantile	β	95% CI	t	P values
0.05	136.51	96.58 ~ 176.44	6.70	< 0.001
0.10	100.00	64.09 ~ 135.91	5.46	< 0.001
0.15	70.00	44.27 ~ 95.73	5.33	< 0.001
0.20	50.00	17.48 ~ 82.52	3.01	0.003
0.25	50.00	6.59 ~ 93.41	2.26	0.024
0.30	50.00	9.40 ~ 90.60	2.41	0.016
0.35	50.00	17.69 ~ 82.31	3.03	0.002
0.40	43.86	9.93 ~ 77.80	2.53	0.011
0.45	27.10	−9.67 ~ 63.86	1.44	0.149
0.50	22.01	−14.63 ~ 58.65	1.18	0.239
0.55	13.85	−24.74 ~ 52.44	0.70	0.482
0.60	19.41	−22.95 ~ 61.77	0.90	0.369
0.65	26.05	−7.91 ~ 60.01	1.50	0.133
0.70	28.00	−10.02 ~ 66.02	1.44	0.149
0.75	15.53	−29.56 ~ 60.63	0.68	0.500
0.80	36.84	−6.18 ~ 79.86	1.68	0.093
0.85	25.60	−23.62 ~ 74.82	1.02	0.308
0.90	30.83	−2.58 ~ 64.25	1.81	0.071
0.95	57.47	−2.40 ~ 117.34	1.88	0.060
OLS	43.07	19.31 ~ 66.83	3.55	< 0.001

QR Quantile regress, OLS Ordinary least squares, QR and multiple linear regression analysis adjusted for maternal characteristics (including maternal age, residence, economic status, mother’s education, passive smoking, folate supplementation, pregnancy-induced hypertension, anemia, parity, medication use, number of ANC visit) and neonatal characteristics (including preterm status and neonatal sex)

ISSN: 1824-7288