Results of logistic regression
| Socioeconomic characteristics | Unadjusted OR (95% CI) | Adjusted OR (95% CI) |
| Age | ||
| 15–20 | 1 | 1 |
| 21–30 | 2.87 (1.49 to 5.54)** | 2.26 (1.04 to 4.89)* |
| 31–40 | 4.13 (1.85 to 9.22)** | 3.56 (1.28 to 9.89)* |
| 41–50 | 4.41 (2.01 to 9.64)** | 4.28 (1.60 to 11.26)** |
| 51–60 | 5.55 (1.76 to 17.52)** | 6.17 (1.55 to 24.59)** |
| Sex | ||
| Female | 1 | 1 |
| Male | 3.14 (1.90 to 5.19)** | 2.73 (1.49 to 4.98)** |
| Marital status | ||
| Unmarried | 1 | 1 |
| Married | 0.94 (0.55 to 1.58) | 1.05 (0.53 to 2.08) |
| Widow | 0.20 (0.06 to 0.67)** | 0.17 (0.04 to 0.80)* |
| Household size | ||
| <5 | 1 | 1 |
| 5–10 | 1.58 (0.89 to 2.79) | 1.96 (0.97 to 3.98) |
| 11–15 | 2.91 (1.21 to 7.02)* | 2.49 (0.89 to 6.94) |
| >15 | 6.61 (1.76 to 24.87)** | 5.69 (1.32 to 24.65)* |
| Location | ||
| Urban | 1 | 1 |
| Rural | 0.62 (0.37 to 1.02) | 0.71 (0.39 to 1.31) |
| Literacy | ||
| Illiterate | 1 | 1 |
| Literate | 1.22 (0.75 to 1.98) | 0.86 (0.47 to 1.59) |
| Monthly income (US$) | ||
| <250 | 1 | 1 |
| 250–500 | 1.78 (0.62 to 5.16) | 1.03 (0.31 to 3.42) |
| 501–750 | 1.67 (0.97 to 2.90) | 3.13 (1.00 to 9.83)* |
| >750 | 2.60 (1.02 to 6.64)* | 2.00 (1.11 to 3.60)* |
| House ownership | ||
| No | 1 | 1 |
| Yes | 2.256 (1.37 to 3.71)** | 1.997 (1.10 to 3.60)* |
| Hosmer and Lemeshow test | χ2=7.47, df=8, p=0.487 | |
*p<0.05, **p<0.01.