Table 3.

Quantile Regression on the Relationship Between MS and UCS Vitamin B₁₂ and Folate Levels (β, 95% CI)

Quantiles	Model 1a		Model 2b		Model 3c
	UCS Vitamin B12	UCS Folate	UCS Vitamin B12	UCS Folate	UCS Vitamin B12	UCS Folate
10	0.95* (0.79, 1.10)	0.25* (0.16, 0.34)	0.98* (0.84, 1.12)	0.27* (0.19, 0.35)	0.89* (0.75, 1.03)	0.25* (0.16, 0.35)
20	1.09* (0.96, 1.22)	0.32* (0.26, 0.39)	1.11* (0.97, 1.25)	0.33* (0.26, 0.39)	1.08* (0.95, 1.22)	0.33* (0.27, 0.39)
30	1.29* (1.15, 1.43)	0.33* (0.29, 0.37)	1.34* (1.19, 1.49)	0.33* (0.28, 0.37)	1.24* (1.09, 1.38)	0.32* (0.27, 0.37)
40	1.57* (1.41, 1.73)	0.31* (0.27, 0.35)	1.55* (1.39, 1.72)	0.31* (0.27, 0.35)	1.36* (1.19, 1.53)	0.30* (0.25, 0.34)
50	1.75* (1.58, 1.93)	0.28* (0.24, 0.32)	1.84* (1.66, 2.02)	0.28* (0.24, 0.32)	1.68* (1.49, 1.86)	0.28* (0.24, 0.33)
60	2.05* (1.82, 2.28)	0.26* (0.22, 0.30)	2.09* (1.87, 2.32)	0.27* (0.23, 0.31)	1.89* (1.66, 2.13)	0.27* (0.23, 0.31)
70	2.53* (2.28, 2.78)	0.27* (0.22, 0.32)	2.56* (2.31, 2.81)	0.27* (0.22, 0.32)	2.41* (2.15, 2.68)	0.28* (0.23, 0.33)
80	2.68* (2.42, 2.94)	0.33* (0.15, 0.52)	2.87* (2.63, 3.11)	0.33* (0.14, 0.52)	2.58* (2.32, 2.84)	0.37* (0.18, 0.56)
90	3.11* (2.59, 3.63)	1.20* (0.75, 1.66)	3.07* (2.52, 3.62)	1.21* (0.77, 1.65)	2.95* (2.39, 3.52)	1.04* (0.66, 1.43)
OLS	1.76* (1.57, 1.95)	0.38* (0.30, 0.46)	1.81* (1.63, 2.00)	0.38* (0.30, 0.46)	1.68* (1.49, 1.87)	0.38* (0.30, 0.46)

Notes: ^aModel 1 did not adjust for covariates. ^bModel 2 adjusted for gestational age. In addition to the above covariates, analysis of folate levels adjusted the levels of MS vitamin B₁₂. ^cModel 3 adjusted for socio-demographic characteristics (maternal residence, maternal age, maternal educational level, neonatal gender, gestational age, and parity) and maternal health-related factors from 3 months before pregnancy to delivery (passive smoking, cold, and folic acid supplementation). In addition to the above covariates, analysis of folate levels adjusted the levels of MS vitamin B₁₂. *P <0. 001.