Table 2.
Baseline characteristics of the participants stratified by hypertension
| Characteristic | Group | Hypertension Number of subjects (%) |
χ2 | P value | OR | 95% CI | |
| No | Yes | ||||||
| Number of subjects | 13 087 (67.4) | 6320 (32.6) | |||||
| Sex | Male | 5742 (63.0) | 3376 (37.0) | 155.787 | <0.001 | 1.000 | – |
| Female | 7345 (71.4) | 2944 (28.6) | 0.682 | (0.642 to 0.724) | |||
| Age | 18–44 | 6608 (83.3) | 1323 (16.7) | 1181.906 | <0.001 | 1.000 | – |
| 45–59 | 4722 (61.5) | 2953 (38.5) | 3.124 | (2.898 to 3.366) | |||
| 60–79 | 1757 (46.2) | 2044 (53.8) | 5.811 | (5.327 to 6.338) | |||
| Education | Elementary | 3509 (60.6) | 2280 (39.4) | 282.324 | <0.001 | 1.000 | – |
| Junior | 3779 (67.5) | 1821 (32.5) | 0.742 | (0.687 to 0.801) | |||
| Senior | 3408 (68.8) | 1544 (31.2) | 0.697 | (0.644 to 0.755) | |||
| University | 2391 (78.0) | 675 (22.0) | 0.434 | (0.393 to 0.480) | |||
| Marital status | Married | 11 201 (66.7) | 5581 (33.3) | 366.705 | <0.001 | 1.000 | – |
| Unmarried | 1157 (87.5) | 165 (12.5) | 0.286 | (0.242 to 0.338) | |||
| Separated/divorced | 251 (69.5) | 110 (30.5) | 0.880 | (0.701 to 1.103) | |||
| Widowed | 478 (50.7) | 464 (49.3) | 1.948 | (1.708 to 2.222) | |||
| Occupation | Manual labour | 6159 (67.3) | 2988 (32.7) | 417.761 | <0.001 | 1.000 | – |
| Mental labour | 4634 (74.9) | 1551 (25.1) | 0.688 | (0.640 to 0.739) | |||
| Unemployed | 1107 (61.2) | 702 (38.8) | 1.303 | (1.174 to 1.446) | |||
| Retired | 1187 (52.6) | 1069 (47.4) | 1.850 | (1.685 to 2.031) | |||
| Income (RMB) | <1000 | 5026 (63.2) | 2923 (36.8) | 118.706 | <0.001 | 1.000 | – |
| 1000–3000 | 6641 (69.7) | 2884 (30.3) | 0.747 | (0.701 to 0.795) | |||
| >3000 | 1420 (73.5) | 513 (26.5) | 0.621 | (0.556 to 0.694) | |||
| Smoking | Never | 8293 (69.9) | 3579 (30.1) | 145.176 | <0.001 | 1.000 | – |
| Yes | 3930 (65.8) | 2040 (34.2) | 1.203 | (1.126 to 1.285) | |||
| Ever | 864 (55.2) | 701 (44.8) | 1.880 | (1.689 to 2.092) | |||
| Drinking | No | 9306 (69.8) | 4034 (30.2) | 105.100 | <0.001 | 1.000 | – |
| Yes | 3781 (62.3) | 2286 (37.7) | 1.395 | (1.309 to 1.487) | |||
| Salt intake | Moderate | 4748 (70.7) | 1972 (29.3) | 50.369 | <0.001 | 1.000 | – |
| High salt | 4784 (65.2) | 2548 (34.8) | 1.282 | (1.194 to 1.3777) | |||
| Light | 3555 (66.4) | 1800 (33.6) | 1.219 | (1.128 to 1.317) | |||
| Physical exercise | Never | 6298 (69.6) | 2754 (30.4) | 283.246 | <0.001 | 1.000 | – |
| Frequently | 3430 (59.1) | 2370 (40.9) | 1.580 | (1.475 to 1.693) | |||
| Occasionally | 3359 (73.7) | 1196 (26.3) | 0.814 | (0.752 to 0.882) | |||
| BMI | Normal weight | 6727 (76.2) | 2105 (23.8) | 1063.588 | <0.001 | 1.000 | – |
| Underweight | 752 (88.9) | 94 (11.1) | 0.359 | (0.288 to 0.446) | |||
| Overweight | 4211 (61.5) | 2639 (38.5) | 2.172 | (2.034 to 2.318) | |||
| Obese | 1397 (48.5) | 1482 (51.5) | 3.142 | (2.787 to 3.542) | |||
| Sleep duration | <7 hours/day | 4480 (63.0) | 2626 (37.0) | 103.575 | <0.001 | 1.000 | – |
| 7–8 hours/day | 3415 (68.8) | 1549 (31.2) | 1.292 | (1.197 to 1.396) | |||
| >8 hours/day | 5192 (70.8) | 2145 (29.2) | 0.911 | (0.842 to 0.985) | |||