TABLE 1.
Demographics and baseline characteristics of the study subjects.
| Demographics and baseline characteristics | Low-risk group (n = 86) | High-risk group (n = 72) | p value |
| Age (years) | 51.17 ± 7.30 | 52.73 ± 8.39 | 0.06 |
| Sex | – | – | 0.98 |
| Male | 67(77.9%) | 56(77.8%) | – |
| Female | 19(22.1%) | 16(22.2%) | – |
| Height (m) | (1.62,1.71) | (1.60,1.71) | 0.18 |
| Weight (kg) | 65.05 ± 9.07 | 66.89 ± 9.3 | 0.21 |
| BMI (kg/m2) | 23.70 ± 2.99 | 23.91 ± 2.40 | 0.63 |
| Exposure to dust (former: never) | 22:64 | 20:52 | 0.84 |
| Smoking index (pack-years) | (0,22.5) | (0,28.25) | 0.90 |
| Clinical questionnaires | – | – | – |
| mMRC | 0.17 ± 0.41 | 0.22 ± 0.54 | 0.53 |
| CAT | 3.81 ± 4.57 | 4.36 ± 4.74 | 0.47 |
| CCQ | 1.11 ± 6.19 | 1.31 ± 6.27 | 0.84 |
| Spirometry | – | – | – |
| FEV1 (L) | 2.71 ± 0.67 | 2.64 ± 0.67 | 0.47 |
| FVC (L) | 3.31 ± 0.78 | 3.31 ± 0.75 | 0.93 |
| FEV1/FVC | 0.82 ± 0.07 | 0.79 ± 0.08 | 0.01 |
| FEV1%prep | 0.92 ± 0.14 | 0.86 ± 0.13 | 0.01 |
Data are mean ± standard deviation or median (IQR). p values comparing low-risk group and high-risk group are from two-sample t-test, Mann-Whitney U test, χ2or Fisher’s exact test. BMI: body mass index, mMRC: modified British medical research council, CAT: COPD assessment test, CCQ: clinical COPD questionnaire, FEV1: forced expiratory volume in first second, FVC: forced vital capacity, FEV1/FVC: forced expiratory volume in first second/forced vital capacity, FEV1%prep: forced expiratory volume in first second as a percentage of the expected value.