Table 2.
Basic characteristics of participants in this study
| Factors | Case (n = 9) | Control (n = 28) | p value |
|---|---|---|---|
| Age (years)a | 71.4 ± 11.7 | 65.4 ± 9.5 | 0.126b |
| Residence period (person (%)) | |||
| <40 | 2 (22.2) | 4 (14.8) | 0.717c |
| 40–59 | 6 (66.7) | 17 (63.0) | |
| ≥60 | 1 (11.1) | 6 (22.2) | |
| Average (years) | 46.7 ± 16.1 | 49.8 ± 13.3 | |
| Present job (person (%)) | |||
| Farmer | 7 (77.8) | 26 (92.9) | 0.448c |
| Unemployed | 2 (22.2) | 2 (7.1) | |
| Abandoned mine (person (%)) | |||
| Working experience | 1 (11.1) | 4 (14.3) | 1.000c |
| Working period (years) | 5.0 | 3.0 ± 2.4 | – |
| Smoking habit (person (%)) | |||
| Current | 1 (11.1) | 2 (7.1) | 0.797c |
| Past | – | 1 (3.6) | |
| Non | 8 (88.9) | 25 (89.3) | |
| Drinking habit (person (%)) | |||
| Current | – | 14 (50.0) | 0.014c |
| Past | 1 (11.1) | 4 (14.3) | |
| Non | 8 (88.9) | 10 (35.7) | |
aArithmetic mean ± standard deviation
bIndependent sample t test
cChi-square test (Fisher’s exact test)