Table 3. Adjusted odds ratio and 95% CI for maternal body mass index on miscarriage by maternal smoking habit in Nepal, 2001–2016 (N = 19160).

Exposure Variable	Miscarriage among smokers		Miscarriage among non-smokers
Maternal Body Mass Index	aOR (95% CI)	P-value	aOR (95% CI)	P-value
Normal	Reference		Reference
Underweight	0.99 (0.83, 1.18)	0.876	0.90 (0.64, 1.27)	0.554
Overweight	1.11 (0.92, 1.34)	0.276	1.25 (0.80, 1.94)	0.324
Obesity	1.46 (1.05, 2.04)	0.025	1.15(0.40, 3.31)	0.799

aOR = adjusted Odd Ratio; Model adjusted for: year of survey, types of residence, ecological zone, maternal education, maternal literacy status, wealth index, maternal working status, user of contraception, and maternal age.