Table 1. The demographic characteristics of the studied population.
| Demographic Characteristics | No. | % |
|---|---|---|
| Sex | ||
| Male | 5,150 | 75.8 |
| Female | 1,642 | 24.2 |
| Age in years | ||
| <20 | 1,586 | 23.4 |
| 20–39 | 2,767 | 40.7 |
| 30+ | 2,435 | 35.9 |
| Missing | 4 | 0.1 |
| Occupation | ||
| Student | 1,872 | 27.6 |
| Worker | 1,239 | 18.2 |
| Farmer | 1,239 | 18.2 |
| Jobless | 628 | 9.2 |
| Employee | 104 | 1.5 |
| Clerk | 69 | 1.0 |
| Others | 730 | 10.7 |
| House wife | 882 | 13.0 |
| Missing | 29 | 0.4 |
| Duration | ||
| <1 | 1,691 | 24.9 |
| >1–5 | 2,798 | 41.2 |
| >5–10 | 1,330 | 19.6 |
| >10–20 | 701 | 10.3 |
| >20–30 | 163 | 2.4 |
| 30+ | 52 | 0.8 |
| Missing | 57 | 0.8 |
| Grains | ||
| None | 3,824 | 56.3 |
| Present | 2,830 | 41.7 |
| Missing | 138 | 2.0 |
| Discharge | ||
| Yes | 5,465 | 80.5 |
| No | 919 | 13.5 |
| Unknown | 372 | 5.5 |
| Missing | 36 | 0.5 |
| Pain | ||
| Yes | 1,842 | 27.1 |
| No | 4,790 | 70.5 |
| Sometimes | 32 | 0.5 |
| Missing | 128 | 1.9 |
| Trauma | ||
| Yes | 1,367 | 20.1 |
| No | 4,586 | 67.5 |
| Not sure | 774 | 11.4 |
| Missing | 65 | 1.0 |
| Family history | ||
| Yes | 811 | 11.9 |
| No | 5,127 | 75.5 |
| Missing | 854 | 12.6 |
| Other Medical problem | ||
| Yes | 260 | 3.8 |
| No | 6,509 | 95.8 |
| Missing | 23 | 0.3 |
| Number of previous surgeries | ||
| 0 | 2,944 | 43.4 |
| 1 | 2,545 | 37.5 |
| 2 | 789 | 11.6 |
| 3 | 296 | 4.4 |
| 4 | 205 | 3.0 |
| Missing | 12 | 0.2 |
| Total | 6,791 | 100.0 |