Interactive effects of maternal exposure to chemical fertilizer and socio-economic status on the risk of low birth weight

Table 3 Interactions between maternal socio-economic status and exposure to chemical fertilizer on the risk of low birth weight

SES	Exposure to chemical fertilizer	Cases	Controls	aOR(95%CI)	RERI (95%CI)	P
	Village level ^a
High	Low	40	66	1.00
High	High	34	51	1.07(0.59 ~ 1.96)
Low	Low	36	48	1.04(0.56 ~ 1.91)
Low	High	69	39	2.62(1.44 ~ 4.77)	1.79(1.11 ~ 2.47)	< 0.001
	Household level ^b
High	None	48	81	1.00
High	Yes	26	36	1.25(0.66 ~ 2.35)
Low	None	42	45	1.48(0.84 ~ 2.62)
Low	Yes	63	42	2.18(1.24 ~ 3.83)	0.77(0.14 ~ 1.40)	< 0.05

^aOR were adjusted for meat intake, eggs or milk intake and exposure to household chemical fertilizer use
^bOR were adjusted for meat intake, eggs or milk intake and exposure to village-level chemical fertilizer consumption
SES socio-economic status index, RERI relative excess risk due to interaction

ISSN: 1471-2458