Table 1.

Characteristics of 13 734 children with complete data on wheezing disorders and covariates

	Asthma diagnosis		Wheezing symptoms		Wheezing disorder diagnosis		Wheezing disorder treatment
	Yes/no	Yes (%)	Yes/no	Yes (%)	Yes/no	Yes (%)	Yes/no	Yes (%)
Birth weight (kg)
Normal (2.5–4.0)	668/10 673	5.9	1622/9719	14.3	1907/9434	16.8	2444/8897	21.6
Low (<2.5)	104/1035	9.1	209/930	18.3	246/893	21.6	311/828	27.3
High (>4.0)	69/1185	5.5	163/1091	13.0	194/1060	15.5	280/974	22.3
Ethnicity
White British	217/4284	4.8	586/3915	13.1	706/3795	15.7	1074/3427	23.9
Pakistani	382/4735	7.5	857/4260	16.7	985/4132	19.2	1150/3967	22.5
Others	86/1647	5.0	207/1526	11.9	243/1490	14.0	308/1425	17.8
Gender
Male	502/6415	7.3	1220/5697	17.6	1416/5501	20.5	1775/5142	25.7
Female	318/6172	4.9	742/5748	11.4	890/5600	13.7	1190/5300	18.3
Gestational age
Term	769/12 100	6.0	1841/11 028	14.3	2166/10 703	16.8	2792/10 077	21.7
Preterm	72/793	8.3	153/712	17.7	181/684	20.9	243/622	28.1
Number of births
Singleton	803/12 281	6.1	1923/11 161	14.7	2262/10 822	17.3	2911/10 173	22.2
Twins	17/297	5.4	38/276	12.1	43/271	13.7	52/262	16.6
Triplets	0/9	0	1/8	11.1	1/8	11.1	2/7	22.2
Maternal smoking
No	520/7371	6.6	1162/6729	14.7	1359/6532	17.2	1710/6181	21.7
Yes	167/3295	4.8	490/2972	14.2	578/2884	16.7	823/2639	23.8
Parity
Primiparous	292/4823	5.7	686/4429	13.4	821/4294	16.1	1128/3987	22.1
Multiparous	489/7311	6.3	1210/6590	15.5	1401/6399	18.0	1728/6072	22.2
IMD 2010 quintile score
1	487/7048	6.5	1182/6353	15.7	1372/6163	18.2	1721/5814	22.8
2	115/1939	5.6	253/1801	12.3	304/1750	14.8	435/1619	21.2
3	59/1196	4.7	148/1107	11.8	177/1078	14.1	247/1008	19.7
4	18/317	5.4	41/294	12.2	53/282	15.8	84/251	25.1
5	8/184	4.2	30/162	15.6	33/159	17.2	49/143	25.5

IMD, index of multiple deprivation with 1 and 5 indicating the least deprived and most deprived scores, respectively.