Table 1

Prevalence of asthma and atopy outcomes within the different categories of birth parameter

	No.	Ever asthma	Drug therapy	Asthma in past 2 years	BHR	IgE ⩾150 IU^1-150 ^1-151	Skin test +ve (weal ⩾2 mm)
Birth length (cm)
<50	103	6.9	7.8	4.9	6.3	46.5	35.9
50–51.9	210	15.2	14.3	12.4	8.6	45.2	47.9
52–53.9	267	12.0	12.4	10.5	8.1	38.8	45.6
54–55.9	120	18.3	17.5	17.5	9.6	46.7	49.2
56+	34	32.4	23.5	20.6	9.7	37.5	40.6
Head circumference (cm)
<34	154	9.7	9.1	7.1	6.3	43.0	37.0
34–34.9	197	13.2	14.7	12.2	9.0	39.2	49.0
35–35.9	223	16.3	13.9	13.1	7.9	42.9	43.7
36–36.9	111	18.0	18.0	16.2	8.3	41.1	52.7
37+	49	14.3	12.2	10.2	13.0	61.4	46.8
Birth weight (kg)
<2.5	35	2.9	5.7	2.9	10.3	60.0	48.6
2.5–2.9	115	6.1	6.1	4.4	4.6	41.7	36.5
3.0–3.4	269	20.5	19.0	17.2	10.5	41.0	50.6
3.5–3.9	232	11.2	12.9	9.9	8.4	45.7	45.6
4.0+	84	17.9	11.9	14.3	4.9	37.8	38.3
Relative head circumference^1-152
<125	33	12.1	12.1	12.1	9.4	33.3	30.3
125–138.9	185	11.5	9.7	8.2	6.3	46.8	44.9
139–151.9	296	13.5	13.5	11.5	8.1	38.9	44.8
152–164.9	161	16.2	16.2	14.9	9.9	45.5	45.0
165+	59	22.0	20.3	17.0	10.9	53.5	57.6
Gestational age (weeks)
<37	28	10.7	10.7	10.7	8.0	57.1	50.0
37–37.9	23	13.0	13.0	13.0	13.0	52.6	65.2
38–39.9	209	13.0	12.0	11.0	8.0	39.2	42.7
40–40.9	209	16.8	16.8	13.4	7.5	43.3	49.3
41+	183	15.4	12.6	12.6	9.0.	45.8	42.8
Older siblings
0	246	16.3	15.0	14.3	9.8	39.1	47.4
1	216	14.0	13.9	11.1	7.3	44.5	47.1
2	122	13.9	11.5	10.7	8.9	41.5	45.4
3+	151	11.3	12.6	9.9	6.8	49.1	39.3
Sex
Female	355	10.2	9.9	8.7	6.2	39.2	37.8
Male	380	17.9	17.1	14.8	10.2	46.4	52.3