Baseline characteristics of the two groups exercising with and without facemasks before and after propensity score matching
| Variable | Category | Before adjusting for propensity score | After adjusting for propensity score | ||||
| 2015 (no mask) (n=651) | 2021 (with mask) (n=525) | P value | 2015 (no mask) (n=378) | 2021 (mask) (n=378) | P value | ||
| Age | – | 56.7±12.2 | 59.6±12.8 | <0.001 | 58.2±12.5 | 59.7±12.5 | 0.61 |
| Sex | Female | 281 (43.2%) | 280 (53.3%) | 0.001 | 178 (47.1%) | 169 (44.7%) | 0.51 |
| Male | 370 (56.8%) | 245 (46.7%) | 200 (52.9%) | 209 (55.3%) | |||
| Hypertension | No | 403 (61.9%) | 264 (50.4%) | <0.001 | 218 (57.7%) | 219 (57.9%) | 0.94 |
| Yes | 248 (38.1%) | 260 (49.6%) | 160 (42.3%) | 159 (42.1%) | |||
| Diabetes | No | 506 (77.7%) | 399 (76.1%) | 0.52 | 293 (77.5%) | 297 (78.6%) | 0.73 |
| Yes | 145 (22.3%) | 125 (23.9%) | 85 (22.5%) | 81 (21.4%) | |||
| Cholesterol | No | 328 (50.4%) | 311 (59.3%) | 0.002 | 227 (60.0%) | 211 (55.8%) | 0.24 |
| Yes | 323 (49.6%) | 213 (40.7%) | 151 (40.0%) | 167 (44.2%) | |||
| Family history | No | 412 (63.3%) | 369 (70.4%) | 0.01 | 256 (67.7%) | 253 (66.9%) | 0.82 |
| Yes | 239 (36.7%) | 155 (29.6%) | 122 (32.3%) | 125 (33.1%) | |||
| Smoking | No | 547 (84.0%) | 444 (85.1%) | 0.63 | 325 (86.0%) | 316 (83.6%) | 0.36 |
| Yes | 104 (16.0%) | 78 (14.9%) | 53 (14.0%) | 62 (16.4%) | |||
| Systolic blood pressure | – | 159.1±18.3 | 171.5±22.6 | <0.001 | 163.4±17.5 | 162.7±17.7 | 0.62 |
| Heart rate | – | 152.4±14.6 | 152.5±17.1 | 0.91 | 151.5±15.0 | 152.4±16.6 | 0.45 |