Table 1.
Characteristics of the study subjects
| Variable | Total (n = 6043) | Non‐PiAR (n = 4928) | PiAR (n = 1115) | P value |
|---|---|---|---|---|
| Age (y),median (interquartile range) | 27.6 (19.1) | 26.1 (38.6) | 29.3(27.2) | .006 |
| Gender, n (%) | ||||
| Male | 2900 | 2331 (80.4) | 569 (19.6) | .024 |
| Female | 3143 | 2597 (82.6) | 546 (17.4) | |
| Age group (y), n (%) | ||||
| 0‐6 | 1028 | 960 (93.4) | 68 (6.6) | <.001 |
| 7‐12 | 945 | 794 (84.0) | 151 (16.0) | |
| 13‐17 | 448 | 324 (72.3) | 124 (27.7) | |
| 18‐39 | 1512 | 1054 (69.7) | 458 (30.3) | |
| 40‐59 | 1553 | 1287 (82.9) | 266 (17.1) | |
| ≥60 | 535 | 489 (91.4) | 46 (8.6) | |
| Race, n (%) | ||||
| Han | 3288 | 2699 (82.1) | 589 (17.9) | .151 |
| Mongolian | 2486 | 2002 (80.5) | 484 (19.5) | |
| Other | 269 | 227 (84.4) | 42 (15.6) | |
| Residence, n (%) | ||||
| Urban | 2961 | 2278 (76.9) | 683 (23.1) | <.001 |
| Rural | 3079 | 2647 (86.0) | 432 (14.0) | |
| Annual family income (CNY, median (interquartile range)b | 5 (5) | 5 (4) | 5 (7) | <.001 |
| Study areaa, n (%) | ||||
| Erenhot | 1008 | 766 (76.0) | 242 (24.0) | <.001 |
| Xilinhot | 842 | 578 (68.6) | 264 (31.4) | |
| Duolun | 1028 | 893 (86.9) | 135 (13.1) | |
| Jarud | 1143 | 900 (78.7) | 243 (21.3) | |
| Kailu | 1000 | 876 (87.6) | 124 (12.4) | |
| Tongliao | 1022 | 915 (89.5) | 107 (10.5) | |
| Total | 6043 | 4928 (81.5) | 1115 (18.5) | |
Chi‐square test and t test were performed in this table.
a
Comparison between six study areas.
b
The value is in Chinese Yuan (CNY).