* Chi-square or Fisher’s exact test. Significance at P < 0.05
† Independent t test. Significance at P < 0.05
‡ Obesity (BMI, body mass index, kg/m2) was categorized as < 18.5 (underweight), ≥ 18.5 to < 23 (normal), ≥ 23 to < 25 (overweight), ≥ 25 to < 30 (obese I), and ≥ 30 (obese II).
Table 2 Crude and adjusted hazard ratios (95% confidence interval) for death in asthma and non-asthma groups with subgroup analyses