Table 3.
Logistic regression model for presence of shortness of breath after regular activities in the past 30 days
| Variable | Model 2A (n = 6,024) |
Model 2B (n = 6,012) |
Model 2C (n = 5,902) |
||||||
| OR | 95% CI | p value | OR | 95% CI | p value | OR | 95% CI | p value | |
| Smoking level (days smoking at least one puff) | |||||||||
| 0 | Ref | Ref | Ref | ||||||
| 1–4 | 1.19 | 1.04–1.42 | .03 | 1.15 | 1.00–1.40 | .11 | 1.12 | 0.97–1.36 | .21 |
| 5–10 | 1.72 | 1.37–2.16 | <.001 | 1.70 | 1.37–2.24 | <.001 | 1.55 | 1.24–2.04 | .001 |
| 11–20 | 1.97 | 1.39–2.47 | <.001 | 1.89 | 1.47–2.73 | <.001 | 1.61 | 1.23–2.33 | .004 |
| 21–30 | 2.45 | 2.03–2.96 | <.001 | 2.31 | 1.99–3.00 | <.001 | 1.71 | 1.38–2.26 | <.001 |
| Demographics | |||||||||
| Age | 0.93 | 0.90–0.96 | <.001 | 0.93 | 0.90–0.96 | <.001 | |||
| Gender (male vs. female) | 1.91 | 1.68–2.10 | <.001 | 1.89 | 1.67–2.09 | <.001 | |||
| Ethnicity (White vs. others) | 1.24 | 1.04–1.45 | .01 | 1.24 | 1.04–1.46 | .01 | |||
| Health variables (number of days) | |||||||||
| Drank alcohol | 1.01 | 0.99–1.02 | .08 | 1.01 | 0.98–1.01 | .40 | |||
| Exercising at least 20 min | 0.97 | 0.97–0.98 | <.001 | 0.97 | 0.97–0.98 | <.001 | |||
| Sleeping at least 6 hr | 0.99 | 0.98–1.00 | .003 | 0.99 | 0.98–1.00 | .004 | |||
| Environmental tobacco smoke (number of days exposed) | 1.02 | 1.01–1.03 | <.001 | ||||||
Note. OR = odds ratio; CI = confidence interval.