Table 2.
Comparison of studied risk factors of preterm delivery between term and pre term pregnancy
| Risk factor | Term n (%) | Preterm n (%) | P value |
|---|---|---|---|
| Multipartite | |||
| Yes | 3 (6.7) | 42 (93.3) | < 0.001 |
| No | 403 (53) | 357 (47) | |
| Fetal anomaly | |||
| Yes | 8 (29.6) | 19 (70.4) | 0.022 |
| No | 398 (51.2) | 380 (48.8) | |
| Prenatal care | |||
| Yes | 159 (56.8) | 121 (43.2) | 0.005 |
| No | 247 (47) | 278 (53) | |
| Smoking | |||
| Yes | 0 (0) | 8 (100) | 0.004 |
| No | 406 (50.9) | 391 (49.1) | |
| Alcohol usage | |||
| Yes | 0 (0) | 1 (100) | 0.496 |
| No | 406 (50.5) | 398 (49.9) | |
| Opium usage | |||
| Yes | 4 (28.6) | 10 (71.4) | 0.083 |
| No | 402 (50.8) | 389 (49.2) | |
| Folic acid consumption | |||
| Yes | 149 (57.3) | 111 (42.7) | 0.004 |
| No | 257 (47.2) | 288 (52.8) | |
| Metformin consumption | |||
| Yes | 5 (62.5) | 3 (37.5) | 0.372 |
| No | 401 (50.3) | 396 (49.7) | |
| Iron consumption | |||
| Yes | 371 (55.1) | 302 (44.9) | < 0.001 |
| No | 35 (26.5) | 97 (73.5) | |
| In vitro fertilization | |||
| Yes | 6 (26.1) | 17 (73.9) | 0.014 |
| No | 400 (51.2) | 382 (48.8) | |
| History of infertility | |||
| Yes | 26 (35.6) | 47 (64.4) | 0.005 |
| No | 380 (51.9) | 352 (48.1) | |
| History of abortion | |||
| Yes | 71 (51.1) | 68 (48.9) | 0.471 |
| No | 335 (20.3) | 331 (49.7) | |
| History of preterm delivery | |||
| Yes | 8 (36.4) | 14 (63.6) | 0.131 |
| No | 398 (50.8) | 385 (49.2) | |
| History of IUFD | |||
| Yes | 8 (36.4) | 14 (63.6) | 0.131 |
| No | 398 (50.8) | 385 (49.2) | |
| Amniotic fluid leak | |||
| Yes | 79 (33.3) | 158 (66.7) | <0.001 |
| No | 327 (57.6) | 241 (42.4) | |
| Rupture of membranes | |||
| Yes | 30 (22.9) | 101 (77.1) | < 0.001 |
| No | 376 (55.8) | 298 (44.2) | |
| History of caesarian section | |||
| Yes | 142 (65.1) | 76 (34.9) | < 0.001 |
| No | 264 (45) | 323 (55) | |
| Cephalic presentation | |||
| Yes | 343 (56.6) | 263 (43.3) | < 0.001 |
| No | 63 (31.7) | 136 (68.3) | |
| History of trauma | |||
| Yes | 3 (20.3) | 12 (80) | 0.015 |
| No | 403 (51) | 387 (49) | |
| History of surgery | |||
| Yes | 34 (54) | 29 (46) | 0.326 |
| No | 372 (50.1) | 370 (49.9) | |
| Vaginal bleeding | |||
| Yes | 6 (18.8) | 26 (81.3) | < 0.001 |
| No | 400 (51.7) | 373 (48.3) | |
| Vaginal infection | |||
| Yes | 5 (35.7) | 9 (64.3) | 0.200 |
| No | 401 (50.7) | 390 (49.3) | |
| Placenta decolman | |||
| Yes | 3 (16.7) | 15 (83.3) | 0.003 |
| No | 403 (51.2) | 384 (48.8) | |
| Placenta praevia | |||
| Yes | 4 (40) | 6 (60) | 0.365 |
| No | 402 (50.6) | 393 (49.4) | |
| Polyhydramnios | |||
| Yes | 3 (37.5) | 5 (62.5) | 0.353 |
| No | 403 (50.6) | 394 (49.4) | |
| Oligohydramnios | |||
| Yes | 12 (25) | 36 (75) | < 0.001 |
| No | 394 (52) | 363 (48) | |
| Urinary tract infection | |||
| Yes | 65 (56.5) | 50 (43.5) | 0.095 |
| No | 341 (49.4) | 349 (50.6) | |
| Systemic disease | |||
| Yes | 133 (60.2) | 88 (39.8) | < 0.001 |
| No | 273 (46.7) | 311 (53.3) | |
| Anemia | |||
| Yes | 31 (51.7) | 29 (48.3) | 0.475 |
| No | 375 (50.3) | 370 (49.7) | |
| History of hypertension | |||
| Yes | 58 (40.6) | 85 (59.4) | 0.006 |
| No | 348 (52.6) | 314 (47.4) | |
| Preeclampsia | |||
| Yes | 13 (27.7) | 34 (72.3) | 0.001 |
| No | 393 (51.8) | 385 (48.2) | |
| Eclampsia | |||
| Yes | 1 (20) | 4 (80) | 0.181 |
| No | 405 (50.6) | 395 (49.4) | |
| Chorioamnionitis | |||
| Yes | 1 (8.3) | 11 (91.7) | 0.003 |
| No | 405 (51.1) | 388 (48.9) | |
| Uterine abnormalities | |||
| Yes | 6 (28.6) | 15 (71.4) | 0.034 |
| No | 400 (51) | 384 (49) | |
| Cervical insufficiency | |||
| Yes | 0 (0) | 10 (100) | 0.001 |
| No | 406 (51.1) | 389 (48.9) | |
| Placental insufficiency | |||
| Yes | 0 90) | 3 (10) | 0.121 |
| No | 406 (50.6) | 396 (49.4) | |
| Polycystic ovary | |||
| Yes | 1 (33.3) | 2 (66.7) | 0.493 |
| No | 405 (50.5) | 397 (49.5) | |
| Body mass index | |||
| Yes | 12 (63.2) | 7 (36.8) | 0.187 |
| No | 394 (50.1) | 392 (49.9) | |
| Intercourse during the previous week | |||
| Yes | 1 (6.3) | 15 (93.8) | < 0.001 |
| No | 405 (51.3) | 384 (48.7) | |
| Short time since last delivery | |||
| Yes | 7 (30.4) | 16 (69.6) | 0.040 |
| No | 399 (51) | 383 (49) | |
| History of dental infection | |||
| Yes | 1 (14.3) | 6 (85.7) | 0.59 |
| No | 405 (50.8) | 393 (49.2) | |
| History of respiratory infection | |||
| Yes | 2 (50) | 2 (500 | 0.681 |
| No | 404 (50.4) | 397 (49.6) |
IUFD: Intrauterine fetal death.