In multivariate regression analysis, both total SHS exposure in the past 12 months (B=0.027, 95% CI 0.000–0.054, p=0.048) and total lifetime SHS exposures (B=0.005, 95% CI 0.002–0.008, p=0.000) were significantly related to increasing GGO (Figure 1) score (Table 2, Table 3).