TABLE 1.
Characteristics of study participants
| Total | April to August | September to March | P | |
|---|---|---|---|---|
| N | 6158 | 2624 (42.6) | 3534 (57.4) | |
| Gender (n,%) | ||||
| Men | 2686 (43.6) | 1144 (43.6) | 1542 (43.6) | .978 |
| Women | 3472 (56.4) | 1480 (56.4) | 1992 (56.4) | |
| Age (years) | 40.0 ± 9.0 | 40.4 ± 8.9 | 39.8 ± 9.0 | .014 |
| Age groups (n, %) | ||||
| 19‐29 y | 865 (14.0) | 344 (13.1) | 521 (14.7) | .003 |
| 30‐39 y | 1911 (31.0) | 767 (29.2) | 1144 (32.4) | |
| 40‐49 y | 2289 (37.2) | 1030 (39.3) | 1259 (35.6) | |
| 50‐55 y | 1093 (17.7) | 483 (18.4) | 610 (17.3) | |
| Year of birth | ||||
| Before 1960s | 1072 (17.4) | 469 (17.9) | 603 (17.1) | .003 |
| 1960s | 2139 (34.7) | 974 (37.1) | 1165 (33.0) | |
| 1970s | 1726 (28.0) | 688 (26.2) | 1038 (29.4) | |
| 1980s | 814 (13.2) | 329 (12.5) | 485 (13.7) | |
| 1990s | 407 (6.6) | 164 (6.3) | 243 (6.9) | |
| Ethnic groups | ||||
| Han | 1772 (28.8) | 732 (27.9) | 1040 (29.4) | .380 |
| Mongolian | 847 (13.8) | 375 (14.3) | 472 (13.4) | |
| Hui | 314 (5.1) | 128 (4.9) | 186 (5.3) | |
| Kazakh | 2594 (42.1) | 1124 (42.8) | 1470 (41.6) | |
| Uygur | 571 (9.3) | 245 (9.3) | 326 (9.2) | |
| Others | 60 (1.0) | 20 (0.8) | 40 (1.1) | |
| Family history | 1328 (31.9) | 576 (32.5) | 752 (31.4) | .266 |
| Body mass index (kg/m2) | 25.7 ± 4.2 | 25.8 ± 4.2 | 25.7 ± 4.2 | .499 |
| Waist circumference (cm) | 85.7 ± 11.7 | 85.6 ± 11.5 | 85.7 ± 12.0 | .843 |
| Cigarette consumption (n,%) | 698 (22.7) | 301 (23.3) | 397 (22.3) | .124 |
| Alcohol intake (n,%) | 280 (54.2) | 113 (54.3) | 167 (54.0) | .950 |
Values are presented as number (%), Mean ± standard deviation.