Table 1.

Mean ± s.e. and sample sizes of birth metric, split by maternal birth cohort.

maternal cohort	weight (kg)	height (mm)	head circumference (mm)	ponderal index (kg m–3)
before 1975	2.96 ± 0.42 (n = 1413)	494.76 ± 25.03 (n = 687)	339.62 ± 13.31 (n = 1146)	24.55 ± 3.76 (n = 667)
1975–1984	2.92 ± 0.38 (n = 470)	491.16 ± 29.61 (n = 372)	341.80 ± 14.60 (n = 362)	25.17 ± 6.77 (n = 359)
after 1984	2.95 ± 0.38 (n = 56)	494.98 ± 24.63 (n = 40)	340.86 ± 14.25 (n = 37)	24.55 ± 3.45 (n = 39)
total	2.95 ± 0.41 (n = 1939)	493.55 ± 26.69 (n = 1099)	340.16 ± 13.67 (n = 1545)	24.76 ± 4.98 (n = 1065)