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. 2017 Jan 8;5(1):e3.

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.