Wheeze (n=27) | No wheeze (n=71) | 95% CI of difference between wheeze and no wheeze2-b | |
Boys (n) | 63% (17) | 45% (32) | –4 to 40 |
First degree relative with asthma (n) | 52% (14) | 18% (13) | 13 to 532-153 |
Postnatal maternal smoking (n) | 63% (17) | 30% (21) | 11 to 552-151 |
Birth weight (g) | 3189 (557) | 3508 (456) | –536 to –1012-151 |
Gestation (weeks) | 39.4 (1.7) | 40.2 (1.4) | –1.4 to –0.12-150 |
Gestation-specific birthweight SD score17 | –0.44 (0.87) | 0.00 (1.00) | –0.87 to 0.002-150 |
Birth weight centile17 | 35.5 (25.1) | 49.4 (28.4) | –26.3 to –1.62-150 |
Urinary cotinine:creatinine (ng:mg)2-c | 120.3 (56.5–306.3) | 46.0 (16.2–107.3) | 1.5 to 4.52-153 |
↵2-a Data shown as mean (SD) for continuous and % (n) for categorical variables; information on prior wheeze missing in two infants.
↵2-b Confidence intervals of difference in group means or percentages.
↵2-c Urinary cotinine:creatinine ratios shown as geometric means (interquartile ranges) and their ratio (95% CI) with:without prior wheezing.
↵2-150 p⩽0.05;
↵2-151 p⩽0.01;
↵2-153 p⩽0.001 (two sidedt test for independent samples).