Figure 3

Comparisons of never-smoker proportions in women based on pulmonary function types and the presence of glaucoma. The proportions of never-smokers were significantly higher in women with COPD and glaucoma when compared to women with COPD but no glaucoma. The differences were also statistically significant when compared to women with glaucoma who had restrictive or normal lung function. The asterisk indicates a P value < 0.05.