Table 1.
Clinical characteristics of the study participants (n = 6519).
| Characteristics | Secondhand Smoke Exposure | ||
|---|---|---|---|
| No Exposure, n = 6004 | Exposure, n = 515 | P value | |
| Secondhand smoke exposure | |||
| Location, % | |||
| At home only | N/A | 235 (46) | |
| At work only | N/A | 94 (18) | |
| At both home and work | N/A | 174 (34) | |
| Missing value | N/A | 12 (2) | |
| Exposure hours per week, median (IQR) | N/A | 1.2 (0.5 to 5) | |
| Demographic data | |||
| Age, yr | 51 ± 10 | 48 ± 10 | < 0.001*** |
| Women | 4682 (78) | 384 (75) | 0.077 |
| Body mass index, kg/m2 | 23.8 ± 3.5 | 24.2 ± 3.6 | 0.005** |
| Alcohol status, ever | 169 (3) | 34 (7) | < 0.001*** |
| Physical activity, yes | 2834 (47) | 192 (37) | < 0.001*** |
| Married, yes | 5543 (92) | 478 (93) | 0.795 |
| Educational status, ≧ college | 3108 (52) | 203 (39) | < 0.001*** |
| Systolic blood pressure, mm Hg | 117 ± 18 | 116 ± 18 | 0.242 |
| Diastolic blood pressure, mm Hg | 71 ± 11 | 71 ± 11 | 0.900 |
| Comorbidities | |||
| Hypertension | 677 (11) | 63 (12) | 0.515 |
| Diabetes mellitus | 288 (5) | 20 (4) | 0.388 |
| Dyslipidemia | 443 (7) | 41 (8) | 0.600 |
| Asthma | 234 (4) | 29 (6) | 0.061 |
| Chronic kidney disease | 66 (1) | 7 (1) | 0.515 |
| Coronary artery disease | 68 (1) | 4 (1) | 0.659 |
| Arrythmia | 290 (5) | 25 (5) | 1.000 |
| Peptic ulcer | 922 (15) | 79 (15) | 1.000 |
| Depression | 203 (3) | 14 (3) | 0.521 |
| Gout | 140 (2) | 11 (2) | 0.879 |
IQR = Interquartile range.
** means P value < 0.01; and *** means P value < 0.001.