Table 2.
Comparison of sociodemographic characteristics between the follow-up group and those lost to follow-up.
| Content and group | Follow-up (N=2704), n (%) | Lost to follow-up (N=297), n (%) | Chi-square (df) | P value | |
| Gender | 0.004 (1) | .95 | |||
| Male | 1415 (52.33) | 156 (52.53) | |||
| Female | 1289 (47.67) | 141 (47.47) | |||
| Age (years) | 8.3 (3) | .04 | |||
| 18-29 | 259 (9.58) | 39 (13.13) | |||
| 30-39 | 637 (23.56) | 57 (19.19) | |||
| 40-49 | 981 (36.28) | 97 (32.66) | |||
| 50-69 | 827 (30.58) | 104 (35.02) | |||
| Ethnicity | 0.03 (1) | .86 | |||
| Han | 2693 (99.59) | 296 (99.66) | |||
| Minority | 11 (0.41) | 1 (0.34) | |||
| Education | 4.5 (4) | .34 | |||
| Illiterate | 206 (7.62) | 25 (8.42) | |||
| Elementary school | 702 (25.96) | 77 (25.93) | |||
| Middle school | 1216 (44.97) | 146 (49.16) | |||
| High school | 424 (15.68) | 37 (12.46) | |||
| College or university | 156 (5.77) | 12 (4.04) | |||
| Marital status | 7.7 (2) | .02 | |||
| Unmarried | 105 (3.88) | 18 (6.06) | |||
| Married | 2521 (93.23) | 264 (88.89) | |||
| Divorced | 78 (2.88) | 15 (5.05) | |||
| Occupation | 20.8 (6) | .002 | |||
| Migrant worker | 1357 (50.18) | 183 (61.62) | |||
| Agency or institutional personnel | 219 (8.1) | 27 (9.09) | |||
| Businesspeople | 744 (27.51) | 63 (21.21) | |||
| Students | 21 (0.78) | 3 (1.01) | |||
| Unemployed | 45 (1.66) | 1 (0.34) | |||
| Retirees | 12 (0.44) | 0 (0) | |||
| Others | 306 (11.32) | 20 (6.73) | |||
| 2-week morbidity | 0.3 (1) | .59 | |||
| Yes | 379 (14.02) | 45 (15.15) | |||
| No | 2325 (85.98) | 252 (84.85) | |||