Table 2.

Multivariate analysis of risk factors associated with Birth defects (n=66,123)

	aOR (95% C.I.)	p-value
Age of mother
20-< 35 years	Reference
< 20 years	1.64 (1.18–2.28)	0.003
> 35 years	0.94 (0.57–1.54)	0.79
Ethnicity
Brahmin/Chhetri (relatively advantaged group)	Reference
Others (relatively disadvantaged group)	1.78 (1.46–2.18)	< 0.001
Type of fuel
Clean
Polluted	2.26 (1.80–2.84)	< 0.001
Sex of the baby
Boy	Reference
Girl	1.35 (1.13–1.61)	0.001
Parity
Nullipara	Reference
Primipara	1.58 (1.26–1.98)	< 0.001
Multipara	2.33 (1.84–2.95)	< 0.001
Multiple delivery
No	Reference
Yes	1.80 (0.98–3.28)	0.06
Constant	0.002	< 0.001

aOR adjusted Odds Ratio