Table 1.
Participant characteristics (n = 69)
| Age, yr | 69 (8) |
| Sex, % male | 57 |
| White race, % | 90 |
| Smoking, pack-years | 56 (30) |
| Baseline post-bronchodilator FEV1 % predicted | 54 (16) |
| GOLD stage, % | |
| II | 48 |
| III | 40 |
| IV | 12 |
| Daily health assessment average values | |
| BCSS score | 2.7 (2.2) |
| Inhaler use, puffs/d | 0.88 (1.3) |
| Morning FEV1, L | 1.3 (0.6) |
| Evening FEV1, L | 1.3 (0.6) |
| Environmental characteristics (n = 601 study days) | |
| Daily maximal indoor temperature, °F | 80.1 (6.7) |
| Daily average indoor relative humidity, % | 40.8 (8.5) |
| Weekly average indoor PM2.5, μg/m3 | 13.1 (15.4) |
| Weekly average indoor NO2, ppb | 11.3 (11.7) |
| Days of reported central air conditioning use, % | 50 |
| Days of reported window-unit air conditioning use, % | 18 |
| Days reported with no air conditioning use, % | 37 |
| Days that participants went outdoors, % | 47 |
| Time outdoors on days that participants went outdoors, h | 1.95 (2.07) |
| Daily maximal outdoor temperature, °F | 84.9 (9.9) |
| Daily average outdoor PM2.5, μg/m3 | 12.8 (6.3) |
| Daily average outdoor NO2, ppb | 27.5 (11.1) |
| Daily average outdoor ozone, ppb | 35.2 (8.7) |
| Daily average outdoor relative humidity, % | 58.3 (13.1) |
Definition of abbreviations: BCSS = Breathlessness, Cough, and Sputum Scale; GOLD = Global Initiative for Chronic Obstructive Lung Disease; PM = particulate matter.
Data are presented as mean (SD) unless otherwise indicated.