Table 1

Characteristics of participants in the study versus the whole population seen

Study participants (n)Total population at 18-year follow-up (%)p Value*
Female gender52.9% (423/799)50% (660/1313)0.196
Active smoking24.7% (198/799)28% (368/1313)0.145
Full-time education78% (624/799)68% (898/1313)<0.001
Atopic at 10†26.7% (189/709)26.9% (279/1036)0.956
Asthma19.3% (155/799)17.5% (231/1313)0.6045

  • ↵* Z-test of proportions (two-sided) for comparison between participants analysed in this study and all those assessed at 18 years of age.

  • ↵† Numbers reflect those who attended at 10-year and at 18-year follow-up.