Table 1 Demographic characteristics
Variables | 2018 | 2019 | 2020 |
|---|---|---|---|
Gender | |||
 Male | 300 (26.86) | 273 (24.57) | 304 (26.71) |
 Female | 817 (73.14) | 838 (75.43) | 834 (73.29) |
Age | |||
  ≤ 30 | 334 (29.90) | 323 (29.07) | 331 (29.09) |
 31–40 | 467 (41.81) | 486 (43.74) | 505 (44.38) |
 41–50 | 215 (19.25) | 213 (19.17) | 219 (19.24) |
  ≥ 51 | 101 (9.04) | 89 (8.01) | 83 (7.29) |
Marital status | |||
 Unmarried | 204 (18.26) | 217 (19.60) | 249 (21.88) |
 Married | 878 (78.60) | 855 (77.24) | 854 (75.04) |
 Other | 35 (3.13) | 35 (3.16) | 35 (3.08) |
Education | |||
 High school and below | 46 (3.58) | 39 (3.51) | 37 (3.25) |
 Junior college | 224 (20.05) | 204 (18.35) | 207 (18.20) |
 College | 614 (54.97) | 646 (58.09) | 650 (57.12) |
 Master’s degree and above | 240 (21.40) | 223 (20.05) | 244 (17.57) |
Professional title | |||
 Senior | 54 (4.83) | 51 (4.59) | 39 (3.43) |
 Sub-senior | 190 (17.01) | 175 (15.74) | 191 (16.78) |
 Middle | 351 (31.42) | 359 (32.28) | 351 (30.84) |
 Junior | 451 (40.38) | 433 (38.94) | 429 (37.70) |
 None | 71 (6.36) | 94 (8.45) | 128 (11.25) |
Years of work | |||
  ≤ 5 | 413 (36.97) | 371 (33.39) | 396 (34.80) |
 6–15 | 417 (37.33) | 456 (41.04) | 462 (40.60) |
 16–25 | 133 (11.91) | 135 (12.15) | 149 (13.09) |
  ≥ 26 | 154 (13.79) | 149 (13.41) | 131 (11.51) |
 Total | 1117 (100.00) | 1111 (100.00) | 1138 (100.00) |