Table 1.
The basic characteristics of study population.
| Variables | Total (n = 44,447) |
Male (n = 20,217) |
Female (n = 24,230) |
p-value |
| Age, mean (SD),years | 21.0(2.4) | 21.2(2.5) | 20.9(2.3) | 0.946 |
| Age Group, n (%) | <0.001 | |||
| 16~23 | 39,208(88.2) | 17,571(86.9) | 21,637(89.3) | |
| 24~50 | 5239(11.8) | 2646(13.1) | 2593(10.7) | |
| Education level, n (%) | 0.018 | |||
| Undergraduate | 39,725(89.4) | 18,146(89.8) | 21,579(89.1) | |
| Postgraduate | 4722(10.6) | 2071(10.2) | 2651(10.9) | |
| Birthplace, n (%) | 0.503 | |||
| Hubei | 703(1.6) | 311(1.5) | 392(1.6) | |
| Others | 43,744(98.4) | 19,906(98.5) | 23,838(98.5) | |
| District, n (%) | <0.001 | |||
| Urban | 28,318(63.7) | 12,689(62.8) | 15,629(64.5) | |
| Rural | 16,129(36.3) | 7528(37.2) | 8601(35.5) | |
| Ethnicity, n (%) | <0.001 | |||
| Han | 43,184(97.2) | 19,810(98.0) | 23,374(96.5) | |
| Minorities | 1263(2.8) | 407(2.0) | 856(3.5) | |
| Cumulative number of confirmed cases in the provinces, n (%) | <0.001 | |||
| 1–499 | 5364(12.1) | 2019(10.0) | 3345(13.8) | |
| 500–999 | 2741(6.2) | 1266(6.3) | 1475(6.1) | |
| 1000–9999 | 35,639(80.2) | 16,621(82.2) | 19,018(78.5) | |
| ≥10,000 | 703(1.6) | 311(1.5) | 392(1.6) | |
Abbreviation: SD, standard deviation;.