The odds ratio for passive smoking was not significant either, when the factor of husbands’ smoking was included into the wives model (OR=0.91, 95% CI: 0.45–1.86).
The prevalence of breathlessness increased with age in the wives (OR of wives’ age=1.05, CI: 1.01–1.08), but no other consistent association was detected for the respiratory symptoms of wheezing or breathlessness either in policemen or their wives.