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

Table 1

Distribution of birth weight in age groups.

Birth weight	⁢6-7 yr		⁢13-14 yr
	Number	%	Number	%
<1.5 kg	14	0.5	29	1.3
1.5–2 kg	43	1.4	55	2.4
2–2.5 kg	212	6.8	298	12.9
2.5–3.5 kg	1165	37.6	1104	47.9
>3.5 kg	950	30.6	760	33
Not defined	21	0.9	58	2.5
Missing	697	22.5	1250	35.2
Total	2405	100	2304	100