Table 1 Baseline demographic characteristics of the study patients
Characteristics | Control group (n = 68) | Test group 1 (n = 71) | Test group 2 (n = 71) | P value | statistical analysis |
|---|---|---|---|---|---|
Age, yr | Â | Â | Â | 0.8423 | ANOVA |
 Mean ± SD | 53.81 ± 8.65 | 54.58 ± 9.97 | 53.73 ± 9.73 |  |  |
 Maximum, minimum | 30,68 | 22,72 | 22,69 |  |  |
 Median | 55 | 57 | 54 |  |  |
 95% CI | (51.71 ~ 55.9) | (52.22 ~ 56.94) | (51.43 ~ 56.03) |  |  |
Sex |  |  |  | 0.8397 | χ2 |
 Men | 35 (51.47) | 39 (54.93) | 40 (56.34) |  |  |
 Women | 33 (48.53) | 32 (45.07) | 31 (43.66) |  |  |
Ethnicity |  |  |  | 0.5967 | χ2 |
 Han | 67 (98.53) | 70 (98.59) | 71 (100) |  |  |
 Non-Han | 1 (1.47) | 1 (1.41) | 0 (0) |  |  |
Marital status |  |  |  | 0.4103 | χ2 |
 Unmarried | 0 (0) | 1 (1.41) | 2 (2.82) |  |  |
 Married | 66 (97.06) | 70 (98.59) | 69 (97.18) |  |  |
 Divorced | 1 (1.47) | 0 (0) | 0 (0) |  |  |
 Widowed | 1 (1.47) | 0 (0) | 0 (0) |  |  |
Education |  |  |  | 0.2776 | χ2 |
 Illiteracy (< 1 yr) | 2 (2.94) | 0 (0) | 3 (4.23) |  |  |
 Elementary school (1–6 yr) | 12 (17.65) | 24 (33.8) | 21 (29.58) |  |  |
 Junior high school (7–9 yr) | 14 (20.59) | 16 (22.54) | 19 (26.76) |  |  |
 High school or technical secondary school (10–12 yr) | 26 (38.24) | 20 (28.17) | 14 (19.72) |  |  |
 Junior college and college or above (≥ 13 yr) | 10 (14.71) | 9 (12.68) | 11 (15.49) |  |  |
 Unknown | 4 (5.88) | 2 (2.82) | 3 (4.23) |  |  |
Occupation |  |  |  | 0.0289 | χ2 |
 Mental labor | 32 (47.76) | 23 (32.39) | 21 (29.58) |  |  |
 Physical labor | 20 (29.85) | 32 (45.07) | 40 (56.34) |  |  |
 Other | 15 (22.39) | 16 (22.54) | 10 (14.08) |  |  |