Effect of environmental tobacco smoke on cough in children with a history of tonsillectomy or adenoidectomy.

We examined the possible impact of tonsillectomy or adenoidectomy (T/A) on the relationship between environmental tobacco smoke (ETS) exposure and respiratory outcomes. This study was conducted in Humboldt, Saskatchewan, in 1993. The target population included all residents aged 6-17 yrs. Of the 1,019 eligible subjects, 892 participated (88%). Estimates of ETS exposure were based on the reported smoking habits of the children's household members. We defined current cough as a positive response to the question: "Does this child usually have a cough?". Information also included morning cough, night cough and a history of T/A. For children with no history of T/A, the prevalence of current cough was 8.9%, 12.2% and 14.5% for those living in families with 0, 1, and 2+ smokers respectively. The corresponding prevalence was 7.0%, 30.2% and 36.8% for children with history of T/A. Similar effects of ETS exposure were observed on morning cough and night cough. The results did not change significantly when we used various ETS measures and controlled for confounding factors. Compared to children living in nonsmoking families and without history of T/A, the adjusted odds ratio for children with a history of T/A was 7.19 (p<0.001) if they were living in families smoking >20 cigarettes x day(-1) at home. The corresponding odds ratio was only 1.64 (p=0.11) for children without a history of T/A. We concluded that children living in smoking family were more likely to cough than those living in nonsmoking families and tonsillectomy or adenoidectomy increased the apparent influence of environmental tobacco exposure on cough.