The Association between Birth Weight and Gestational Age and Asthma in 6-7- and 13-14-Year-Old Children

Table 2

Prevalence of asthma symptoms in different subgroups of birth weight (%).

Symptoms	Gender	BW < 1.5 kg		BW = 1.5–2 kg		BW = 2–2.5 kg		BW = 2.5–3.5 kg		BW > 3.5 kg
		6-7 yr	13-14 yr	6-7 yr.	13-14 yr	6-7 yr	13-14 yr	6-7 yr	13-14 yr	6-7 yr
Wheeze ever	Female	30	0	21.4	14.3	22.1	14.4	21.2	7.9	22.6
	Male	25	15.8	53	7.4	27.8	12.3	21.2	8.8	24.5
	Total	28.6	10.3	32.6	10.9	24.5	13.4	21.2	8.4	23.6
Wheeze in the past 12 months	Female	20	0	10.7	10.7	14.6	7.9	14.3	13.4	15.1
	Male	25	10.5	46.7	3.7	18.9	8.4	15.2	4.7	17.6
	Total	21.4	6.9	23.3	7.3	16.5	8.4	14.8	4.3	16.4
Asthma ever	Female	10	10	0	3.6	1.6	1.4	4.5	2.3	3.9
	Male		10.5	0		3.3	7.7	5.4	3.6	6.7
	Total	7.1	10.3	0	1.8	2.4		4.9	3.1	5.4
Wheeze during or after exercise in the past 12 months	Female	10	0	0	10.7	3.3	6.5	6.1	3.3	6.6
	Male	25	10.5	0	0	6.7	8.6	7.1	5.4	8.5
	Total	14.3	6.9	0	5.5	4.7	6.4	6.5	4.3	7.6
Night cough in the past 12 months	Female	20	10	7.1	17.9	16.4	17.3	15.1	7.4	18.9
	Male	50	15.8	33.3	3.7	30	8.4	20.2	7.4	18.9
	Total	28.6	13.8	16.3	10.9	22.2	12.4	17.4	7.3	18.9