Table 4.

Stratified analysis of the effects of infant birth sizes on childhood anemia by maternal folic acid use and occupation.

Classifications	Birth Weight		Crown–Heel Length		Head Circumference
	SDS	Z-Score SDS	SDS	Z-Score SDS	SDS	Z-Score SDS
Folic acid use
Yes	−0.009 (−0.014, −0.004)	−0.008 (−0.013, −0.003)	0.010 (0.005, 0.014)	0.009 (0.005, 0.014)	−0.018 (−0.022, −0.014)	−0.019 (−0.023, −0.014)
No	−0.007 (−0.012, −0.002)	−0.006 (−0.011, −0.001)	0.007 (0.003, 0.011)	0.007 (0.003, 0.011)	0.012 (0.008, 0.016)	0.012 (0.008, 0.016)
p-value for interaction	<0.001		<0.001		<0.001
Occupation
Farmer	−0.008 (−0.013, −0.004)	−0.007 (−0.011, −0.002)	0.009 (0.005, 0.012)	0.009 (0.005, 0.012)	−0.007 (−0.011, −0.004)	−0.007 (−0.011, −0.004)
Non-farmer a	−0.007 (−0.012, −0.001)	−0.007 (−0.013, −0.001)	0.007 (0.002, 0.013)	0.007 (0.001, 0.013)	0.004 (−0.001, 0.009)	0.004 (−0.002, 0.009)
p-value for interaction	<0.001		0.010		0.001

The results are presented as β coefficients with 95% CIs in the multivariate regression models (adjusted for maternal age, BMI, ethnicity, education, parity, anemia during pregnancy, occupation, folic use, follow-up age, SGA, infant sex, caesarean delivery, gestational age, and exclusive breastfeeding). ^a Including workers who work in factories, businessperson, teacher, day laborer, civil servant, or unknown. Abbreviations: 95% CIs, 95% confidence intervals; SDS, standard deviation score; BMI, body mass index; SGA, small for gestational age.