Table.

Infants' birth weight and mothers' mortality, 1976-97, according to data from Office for National Statistics' longitudinal study (England and Wales). Values are hazard ratios (95% confidence interval) unless stated otherwise

Infants' birth weight (g)	No of births	Deaths of mothers
		From all causes (n=293)	From cardiovascular disease (n=41)
<2500	3 891	3.06 (2.15 to 4.35)	7.05 (2.64 to 18.77)
2500-3499	27 360	1.27 (0.96 to 1.69)	1.96 (0.80 to 4.82)
⩾3500	13 562	1.00	1.00
Per 1000 g		1.63 (1.37 to 1.94)	2.25 (1.48 to 3.41)
Per 1000 g (adjusted)*		1.61 (1.35 to 1.92)	2.22 (1.46 to 3.38)

^*Adjusted for socioeconomic position (housing tenure and car access) at the start of the study in 1971 and marital status (sole or joint registration if unmarried) at birth registration. 

Crown copyright reserved.