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%) |  |