Table 4:

Joint effects of SES and kitchen location on birth outcomes among households using biomass fuel (N=750). ^*

	Birth Weight (g)	Low Birth Weight (LBW)	Small for Gestational Age (SGA)
Predictors	Mean	Odds Ratios (CI)	Odds Ratios (CI)
Outdoor kitchen & high SES (N=109)	2704	Ref	Ref
	(2636, 2774)
Outdoor kitchen & low SES (N=223)	2739	0.97	1.03
	(2692, 2788)	(0.56, 1.71)	(0.63, 1.69)
Indoor kitchen & High SES (N=171)	2754	0.82	1.06
	(2699, 2809)	(0.45, 1.48)	(0.64, 1.77)
Indoor Kitchen & Low SES (N=247)	2615	2.08	1.70
	(2570, 2661)	(1.23, 3.58)	(1.06, 2.76)
P-value: interaction	0.002	0.009	0.151

^*All multivariate regression models were adjusted for infant sex, gestational age, maternal age, maternal BMI, parity, and delivery type. SGA models were not adjusted for infant sex and gestational age since SGA was generated adjusting for infant sex and gestational age. Mother’s age was centered to mean age of 22.2 years; BMI to mean value of 21.9 kg/m2, and gestational age to mean of 38.5 weeks.

^†Adjusted effect estimates and 95% confidence interval (CI) are from multivariable linear regression.

^‡Adjusted odds ratio (OR) and 95% confidence interval (CI) are from multivariable logistic regression.