Table 4.
Daily maximal outdoor temperature and COPD health outcomes stratified by whether the participant went outdoors on a given day
| Outcomes | Overall (n = 485) |
Days Participants Stayed Indoors (n = 250) |
Days Participants Went Outdoors (n = 229) |
P Value for Interaction | |||
|---|---|---|---|---|---|---|---|
| Coefficient (95% Confidence Interval) | P Value | Coefficient (95% Confidence Interval) | P Value | Coefficient (95% Confidence Interval) | P Value | ||
| BCSS score | 0.13 (−0.06–0.32) | 0.18 | 0.00 (−0.29–0.29) | 0.985 | 0.38 (0.122–0.628) | 0.004 | 0.045 |
| Rescue inhaler | 0.01 (−0.09–0.10) | 0.912 | 0.01 (−0.14–0.16) | 0.899 | 0.03 (−0.10–0.17) | 0.619 | 0.554 |
| Evening FEV1* | 0.00 (−0.02–0.03) | 0.830 | 0.01 (−0.03–0.04) | 0.749 | −0.01 (−0.06–0.03) | 0.534 | 0.477 |
Definition of abbreviations: BCSS = Breathlessness, Cough, and Sputum Scale; COPD = chronic obstructive pulmonary disease; PM = particulate matter.
Multivariate analysis adjusted for age, sex, education, baseline lung function or smoking history, visit, outdoor PM2.5, outdoor NO2, outdoor ozone, and outdoor relative humidity.
*
n = 479 for overall, 187 for days indoors, and 211 for days participants went outdoors for evening FEV1.