| Category | Cases | Controls | OR (95% CI) | P value | ||
| Yes n (%) | No n (%) | Yes n (%) | No n (%) | |||
| 0 - 3 | 3 (5.2) | 55 (94.8) | 4 (3.4) | 118 (96.7) | 1.57 (0.34 - 7.25) | 0.416 |
| 4 - 6 | 2(3.4) | 56(96.6) | 2(1.7) | 120(98.4) | 2.09 (0.29 - 15.22) | 0.397 |
| ≥7 | 53(91.4) | 5(8.6) | 113(95) | 9(7.4) | 0.56 (0.16 - 1.93) | 0.270 |