Table 1

Maternal characteristics and birth outcomes for TSV born to women with pre-existing diabetes, 2002–2012

	Prelabour caesarean section		Non-instrumental vaginal birth		Instrumental vaginal birth		Intrapartum caesarean section
	n=1286	(%)	n=1969	(%)	n=397	(%)	n=849	(%)
Age (years)
<20	11	0.9	33	1.7	10	2.5	9	1.1
20–24	85	6.6	185	9.4	57	14.4	91	10.7
25–29	246	19.1	436	22.1	89	22.4	209	24.6
30–34	434	33.7	675	34.3	143	36.0	271	31.9
35–39	391	30.4	502	25.5	71	17.9	207	24.4
≥40	119	9.3	138	7.0	27	6.8	62	7.3
Parity
Primiparae	304	23.6	487	24.7	280	70.5	553	65.1
Multiparae	980	76.2	1480	75.2	115	29.0	296	34.9
Not stated	2	0.2	2	0.1	2	0.5	0	0.0
Number of previous caesarean section*
None	136	13.9	1380	93.2	96	83.5	149	50.3
One	602	61.4	67	4.5	19	16.5	115	38.9
Two or more	239	24.4	4	0.3	0	0.0	31	10.5
Not stated	3	0.3	29	2.0	0	0.0	1	0.3
Country of birth
Australian born	862	67.0	1204	61.1	256	64.5	586	69.0
Overseas born	420	32.7	760	38.6	140	35.3	262	30.9
Not stated	4	0.3	5	0.3	1	0.3	1	0.1
Smoking during pregnancy
Smoked	142	11.0	288	14.6	43	10.8	84	9.9
Did not smoke	1140	88.6	1677	85.2	352	88.7	764	90.0
Not stated	4	0.3	4	0.2	2	0.5	1	0.1
Birth weight (g)
Less than 4000	888	69.1	1659	84.3	342	86.1	635	74.8
4000 and over	397	30.9	310	15.7	54	13.6	214	25.2
Not stated	1	0.1	0	0.0	1	0.3	0	0.0
Small for gestational age	62	4.8	151	7.7	23	5.8	50	5.9
Large for gestational age	508	39.5	332	16.9	70	17.6	291	34.3
Sex
Male	682	53.0	962	48.9	208	52.4	446	52.5
Female	604	47.0	1007	51.1	189	47.6	403	47.5
Gestational age (weeks)
37	290	22.6	241	12.2	59	14.9	177	20.8
38	610	47.4	599	30.4	153	38.5	328	38.6
39	321	25.0	605	30.7	103	25.9	202	23.8
40	54	4.2	369	18.7	59	14.9	117	13.8
Greater than 40	11	0.9	155	7.9	23	5.8	25	2.9