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| Gestational age at diagnosis | Term delivery | Preterm delivery | Total (n=518) | Chi-Square | P-value |
| 1st trimester | 107 (82.3%) | 23 (17.7%) | 130 (25.1%) | 0.5432 | 0.76 |
| 2nd trimester | 182 (79.4%) | 47 (20.5%) | 229 (44.2%) | ||
| 3rd trimester | 130 (81.7%) | 29 (18.2%) | 159 (30.7%) | ||
| Total | 419 (80.9%) | 99 (19.1%) | 518 (100%) |
