Sociodemographic characteristics of the participants by insurance status
| Characteristics | All | Without local insurance | With local insurance | P value* |
| n (%) | n (%) | n (%) | ||
| Age (mean, SD), years | 55.5 (11.04) | 60.0 (0.48) | 50.9 (0.50) | |
| 18–44 | 144 (17.0) | 35 (8.2) | 109 (26.1) | <0.001 |
| 45–60 | 409 (48.3) | 167 (38.9) | 242 (57.9) | |
| >60 | 294 (34.7) | 227 (52.9) | 67 (16.0) | |
| Gender | ||||
| Male | 503 (60.7) | 196 (47.5) | 307 (73.8) | <0.001 |
| Female | 326 (39.3) | 217 (52.5) | 109 (26.2) | |
| Education | ||||
| Primary school and below | 219 (25.3) | 153 (35.3) | 66 (15.2) | <0.001 |
| Middle school | 297 (34.3) | 134 (30.9) | 163 (37.6) | |
| High school and equivalent | 238 (27.5) | 106 (24.5) | 132 (30.5) | |
| 3 year college and above | 112 (12.9) | 40 (9.2) | 72 (16.6) | |
| Registration | ||||
| Locals | 133 (16.0) | 0 (0.0) | 133 (30.4) | – |
| Migrants | 700 (84.0) | 396 (100.0) | 304 (69.6) | |
| Occupation | ||||
| Employed | 484 (55.8) | 142 (32.6) | 342 (79.2) | <0.001 |
| Unemployed | 383 (44.2) | 293 (67.4) | 90 (20.8) | |
| Year of hypertension (mean, SD) | 6.0 (5.94) | 6.8 (0.32) | 5.2 (0.26) | <0.001 |
| Family history of hypertension | ||||
| Yes | 384 (45.2) | 188 (43.6) | 196 (46.8) | <0.001 |
| No | 323 (38.0) | 148 (34.3) | 175 (41.8) | |
| Unknown | 143 (16.8) | 95 (22.0) | 48 (11.5) |
*Chi-square test; year of hypertension was continuous with a mean (SD) presented; mean age (SD) was presented.