Table 1 Univariate analysis of individual-level covariates
| Factors |
Reported two-week illness (n = 15,178) |
No reported illness (n = 66,681) | p-value |
|---|---|---|---|
| Age (years) | |||
| < 15 | 1353 (8.9%) | 11,574 (17.4%) | < 0.001#,* |
| 15–29 | 898 (5.9%) | 16,148 (24.2%) | |
| 30–44 | 1738 (11.5%) | 15,492 (23.2%) | |
| 45–59 | 4262 (28.1%) | 14,453 (21.7%) | |
| ≥ 60 | 6927 (45.6%) | 9014 (13.5%) | |
| Gender | |||
| Male | 7160 (47.2%) | 34,427 (51.6%) | < 0.001* |
| Female | 8018 (52.8%) | 32,254 (48.4%) | |
| Ethnicity | |||
| Han | 15,092 (99.4%) | 66,265 (99.4%) | 0.427 |
| Others | 86 (0.6%) | 416 (0.6%) | |
| Education level | |||
| No education | 1914 (12.6%) | 2811 (4.2%) | < 0.001#,* |
| Primary | 5120 (33.7%) | 11,615 (17.4%) | |
| Junior | 4000 (26.4%) | 20,811 (31.2%) | |
| Senior | 1992 (13.1%) | 13,158 (19.7%) | |
| Bachelor or above | 2152 (14.2%) | 18,286 (27.4%) | |
| Marital status | |||
| Unmarried | 926 (6.1%) | 13,118 (19.7%) | < 0.001* |
| Married | 10,758 (70.9%) | 39,010 (58.5%) | |
| Widowed | 2006 (13.2%) | 2093 (3.1%) | |
| Divorced | 101 (0.7%) | 440 (0.7%) | |
| Other | 1387 (9.1%) | 12,020 (18.0%) | |
| Employment status | |||
| Employed | 5915 (39.0%) | 36,876 (55.3%) | < 0.001* |
| Unemployed | 3052 (20.1%) | 3749 (5.6%) | |
| Student | 230 (1.5%) | 4904 (7.4%) | |
| Retired | 5981 (39.4%) | 21,152 (31.7%) | |
| Occupation$ | |||
| Type 1 | 517 (3.4%) | 1894 (2.8%) | < 0.001* |
| Type 2 | 896 (5.9%) | 4369 (6.6%) | |
| Type 3 | 625 (4.1%) | 2217 (3.3%) | |
| Type 4 | 1452 (9.6%) | 8555 (12.8%) | |
| Type 5 | 2633 (17.3%) | 10,470 (15.7%) | |
| Type 6 | 734 (4.8%) | 2693 (4.0%) | |
| Type 7 | 8321 (54.8%) | 36,483 (54.7%) | |
| Type of household registration | |||
| Rural | 9446 (62.2%) | 43,909 (65.8%) | < 0.001* |
| Urban | 5732 (37.8%) | 22,772 (34.2%) | |
| Location of household registration | |||
| In this county | 14,199 (93.5%) | 62,650 (94.0%) | 0.048* |
| Out of this county but in this province | 397 (2.6%) | 1613 (2.4%) | |
| Out of this province | 542 (3.6%) | 2186 (3.3%) | |
| Undetermined | 40 (0.3%) | 232 (0.3%) | |