Items | Univariate P-value | OR (95%CI) | Multivariate P-value | OR (95%CI) |
---|---|---|---|---|
Age (years) | 0.14 | 1.02 (0.99–1.04) | – | – |
Age group | ||||
  ≤ 20 | 0.003 | 1 | 0.034 | 1 |
 21–30 |  < 0.0001 | 1.77 (1.31–2.40) | 0.019 | 1.47 (1.06–2.03) |
 31–40 | 0.13 | 1.51 (0.89–2.58) | 0.89 | 0.96 (0.54–1.71) |
  ≥ 45 | 0.52 | 1.47 (0.46–4.72) | 0.96 | 0.97 (0.30–3.20) |
Residential region |  |  | – | – |
 Eastern China | 0.35 | 1 |  |  |
 Central China | 0.63 | 1.07 (0.83–1.38) |  |  |
 Western China | 0.23 | 0.85 (0.66–1.11) |  |  |
Solitary | 0.036 | 0.79 (0.63–0.99) | 0.001 | 0.67 (0.54–0.85) |
Education |  |  | – | – |
 Middle school or below | 0.32 | 1 |  |  |
 High school or equal | 0.97 | 0.98 (0.29–3.24) |  |  |
 Undergraduate | 0.67 | 0.77 (0.24–2.52) |  |  |
 Graduate or above | 0.82 | 0.87 (0.26–2.91) |  |  |
Occupation | ||||
 Students |  < 0.0001 | 1 |  < 0.0001 | 1 |
 Employees |  < 0.0001 | 1.66 (1.35–2.05) |  < 0.0001 | 1.73 (1.37–2.19) |
 Unemployed | 0.55 | 1.17 (0.71–1.93) | 0.62 | 1.14 (0.68–1.90) |
Annual income ($) |  |  | – | – |
  < 7500 | 0.34 | 1 |  |  |
 7500–15,000 | 0.08 | 1.24 (0.97–1.59) |  |  |
 15,000–30,000 | 0.15 | 1.28 (0.91–1.81) |  |  |
 30,000–450,000 | 0.96 | 0.98 (0.49–1.96) |  |  |
  > 450,000 | 0.80 | 0.90 (0.38–2.11) |  |  |