Table 2.

 Rate ratios (95% confidence interval) for all cause mortality 1915-95 by birth weight, sex, and age at risk for all traced singleton live births delivered at Uppsala Academic Hospital, 1915-29

Age at risk (years)	Birth weight											P value for trend
	< 3250 g			3250-3749 g			3750-4249 g			⩾4250 g
	No of deaths	Rate ratio (95% CI)		No of deaths	Rate ratio (95% CI)		No of deaths	Rate ratio (95% CI)		No of deaths	Rate ratio (95% CI)
Males
<1	259	1.00		114	0.31 (0.25 to 0.39)		78	0.35 (0.27 to 0.45)		30	0.45 (0.31 to 0.65)	< 0.001
1-14	81	1.00		102	0.85 (0.64 to 1.14)		45	0.62 (0.43 to 0.89)		12	0.54 (0.30 to 1.00)	< 0.001
15-64	348	1.00		491	0.94 (0.82 to 1.08)		310	0.98 (0.84 to 1.15)		96	1.00 (0.81 to 1.26)	0.933
⩾65	299	1.00		412	0.89 (0.77 to 1.03)		226	0.82 (0.69 to 0.97)		75	0.90 (0.70 to 1.15)	0.005
Females
<1	216	1.00		86	0.37 (0.29 to 0.47)		35	0.32 (0.22 to 0.45)		8	0.33 (0.16 to 0.66)	< 0.001
1-14	98	1.00		72	0.64 (0.47 to 0.87)		35	0.67 (0.46 to 0.99)		7	0.58 (0.27 to 1.25)	0.003
15-64	243	1.00		286	1.04 (0.87 to 1.23)		128	0.99 (0.80 to 1.22)		33	1.13 (0.78 to 1.62)	0.958
⩾65	204	1.00		236	0.99 (0.82 to 1.19)		102	0.93 (0.73 to 1.18)		27	0.98 (0.65 to 1.47)	0.586