Table 3

Cross tabulations of birth length vs head circumference and relative head circumference for asthma and bronchial hyperresponsiveness (BHR) at age 13, and increased IgE levels at age 11

Prevalence % (No.)
Ever asthma
Head circumference (cm)
Birth length (cm)<3434–36.937+
 <506.6% (76)8.0% (25)(0)
 50–55.912.8% (78)14.8% (480)12.8% (39)
 56+(0)37.5% (24)20.0% (10)
Relative head circumference
Birth length (cm)<125125–164.9165+
 <5012.5% (8)5.8% (87)16.7% (6)
 50–55.912.0% (25)14.1% (533)20.5% (39)
 56+(0)35.0% (20)28.6% (14)
BHR
Head circumference (cm)
Birth length (cm)<3434–36.937+
 <504.3% (70)11.5% (26)(0)
 50–55.98.3% (72)8.4% (463)10.5% (38)
 56+(0)4.4% (23)25.0% (8)
IgE ⩾150 IU
Head circumference (cm)
Birth length (cm)<3434–36.937+
 <5043.6 % (55)56.3% (16)(0)
 50–55.942.4% (59)40.9% (381)63.9% (36)
 56+(0)31.3% (16)50.0% (8)