Table.

Prevalence rates and adjusted odds ratios (95% CI) for self reported gestational diabetes in relation to women's own birth characteristics

Birth characteristics	No of women (n=138 714)	Rate (per 1000 women)	Odds ratio (95% CI)†
Mother with diabetes during pregnancy:
No (referent)	138 518	3.5	1.0
Yes	196	30.6	9.3 (4.1 to 21.1)
Birth weight (g):
<2500	4 652	4.9	1.8 (1.1 to 3.0)**
2500-2999	18 948	4.3	1.6 (1.1 to 2.3)
3000-3499	51 737	4.0	1.4 (1.0 to 2.0)
3500-3999	45 524	3.0	1.1 (0.8 to 1.5)
4000-4500 (referent)	14 852	2.8	1.0
>4500	2 640	4.2	1.5 (0.8 to 2.9)
Weight for gestational age (centiles):
<10	16 034	4.6	1.7 (1.2 to 2.5)**
10-25	23 480	4.4	1.6 (1.1 to 2.3)
>25-50	36 413	3.6	1.3 (0.9 to 1.8)
>50-75	31 329	2.9	1.0 (0.7 to 1.5)
>75-90 (referent)	15 576	2.8	1.0
>90	10 125	3.4	1.2 (0.7 to 1.8)
Ponderal index at birth (g/cm3) ×100:
<2.5	25 752	3.5	1.0 (0.8 to 1.4)
2.5-2.635	28 568	4.5	1.3 (1.0 to 1.7)
2.635-2.752 (referent)	27 441	3.4	1.0
2.752 to 2.89	28 441	3.4	1.0 (0.8 to 1.4)
⩾2.89	27 809	3.2	0.9 (0.7 to 1.3)
Gestational age (weeks):
28-34	1 414	5.7	1.6 (0.8 to 3.3)
35-36	3 261	3.7	0.9 (0.5 to 1.7)
37-39	39 010	3.4	1.0 (0.8 to 1.2)
40 (referent)	37 815	3.4	1.0
41-42	43 818	3.8	1.1 (0.9 to 1.4)
43-44	5 652	3.7	1.1 (0.7 to 1.7)
Weight for gestational age in women <3500 g at birth (centiles):
<10	16 034	4.6	2.9 (0.7 to 12.0)*
10-25	23 480	4.4	2.8 (0.7 to 11.5)
>25-50	25 803	3.6	2.2 (0.5 to 9.1)
>50-75	5 688	3.5	2.1 (0.5 to 8.9)
>75-90 (referent)	975	2.1	1.0
>90	272	3.7	1.3 (0.1 to 18.9)

Because of missing variables, not all characteristics were included for all women. 

^†Adjusted for women's age and parity and their mother's diabetic status. 

^*P<0.01; ^**P<0.001.