Table 1 Laterality, maternal age and birth order characteristics of studied population.
Factor | Value | Bilateral N (%) | Unilateral N (%) | Total N (%) |
|---|---|---|---|---|
Maternal age (years) | <20 years | 19 (8.33) | 36 (7.81) | 55 (7.98) |
20–25 | 61 (26.75) | 146 (31.67) | 207 (30.04) | |
26–30 | 77 (33.77) | 154 (33.41) | 231(33.53) | |
31–35 | 46 (20.18) | 76 (16.49) | 122 (17.71) | |
>35 | 22 (9.65) | 44 (9.54) | 66 (9.58) | |
Missing maternal age data | 3 (1.32) | 5 (1.08) | 8 (1.16) | |
Total | 228 (100.00) | 461 (100.00) | 689 (100.00) | |
Birth order | 1 | 93 (40.79) | 190 (41.21) | 283 (41.07) |
2 | 79 (34.65) | 185 (40.13) | 264 (38.32) | |
3 | 30 (13.16) | 42 (9.11) | 72 (10.45) | |
4 | 14 (6.14) | 25 (5.42) | 39 (5.66) | |
>4 | 12 (5.26) | 18 (3.90) | 30 (4.35) | |
Missing birth order data | 0 (0.00) | 1 (0.22) | 1 (0.15) | |
Total | 228 (100.00) | 461 (100.00) | 689 (100.00) |
