Table 2

Unadjusted trends in outcome variables, and with adjustment for BMI SDS, from 1982 to 1994 in 9574^2-151representative sample in boys aged 8 or 9 years^2-150 with information on symptoms and BMI

	Odds ratio per year (95% confidence interval)
Variable	Unadjusted	Adjusted for BMI SDS
Attacks of asthma	1.09 (1.07 to 1.11)	1.09 (1.07 to 1.11)
Ever wheeze	1.04 (1.03 to 1.06)	1.04 (1.03 to 1.06)
Persistent wheeze	1.02 (0.99 to 1.05)	1.02 (0.99 to 1.05)
Attacks of bronchitis	0.95 (0.92 to 0.98)	0.94 (0.91 to 0.97)
Asthma or bronchitis	1.05 (1.02 to 1.07)	1.04 (1.02 to 1.07)

↵2-150 Selected by year of birth as detailed in text.
↵2-151 Minimum number, with data for attacks of asthma and bronchitis and BMI.