Table 2.
Comparison of maternal variables between case and control groups
| Variable | Situation | Groups | Total n (%) | OR (CI 95%) | Significant level | |
|---|---|---|---|---|---|---|
| Preterm n (%) | Term n (%) | |||||
| Mother’s own prematurity | No | 191 (32.6) | 394 (67.4) | 585 (100) | 3.094 (1.08-8.819) |
0.027† |
| Yes | 9 (60) | 6 (40) | 15 (100) | |||
| Previous delivery | NVD | 77 (34.1) | 149 (65.9) | 266 (100) | 0.665 (0.411-1.077) |
0.096 |
| C/S | 33 (25.6) | 96 (74.1) | 129 (100) | |||
| Episiotomy in previous birth | No | 101(31) | 234 (69) | 339 (100) | 1.642 (0.793-3.400) |
0.178 |
| Yes | 14(42.4) | 19 (57.6) | 33 (100) | |||
| Damage to the vaginal canal | No | 92 (29.9) | 216 (70.1) | 308 (100) | 1.713 (0.986-2.978) |
0.055 |
| Yes | 27 (42.2) | 37 (57.8) | 64 (100) | |||
| previous child death | No | 184 (32.2) | 387 (67.8) | 571 (100) | 2.58 (1.22-5.49) |
0.011† |
| Yes | 16 (55.2) | 13 (44.8) | 29 (100) | |||
| Amniotic fluid status | Normal | 152 (29.3) | 366 (70.7) | 518 (100) | 3.325 (2.059-5.380) |
<0.001† |
| Abnormal | 47 (58) | 34 (42) | 81 (100) | |||
| Premature rupture of membranes | No | 97 (23.9) | 309 (76.1) | 406 (100) | 3.571 (2.483-5.134) |
<0.001† |
| Yes | 102 (52.8) | 91 (47.2) | 193 (100) | |||
| Twin | Single | 146 (27.4) | 387 (72.6) | 533 (100) | 10.807 (5.822-20.408) |
<0.001† |
| Twin and more | 53 (80.3) | 13 (19.7) | 66 (100) | |||
| Infant Gender | Girl | 75 (29.8) | 177 (70.2) | 252 (100) | 1.329 (0.938-1.882) |
0.109 |
| Boy | 125 (36) | 222 (64) | 347 (100) | |||
| History of prematurity | No | 182 (31.7) | 392 (68.3) | 574 (100) | 4.846 (2.069-11.352) |
<0.001† |
| Yes | 18 (69.2) | 8 (30.8) | 26 (100) | |||
| family history of prematurity | No | 179 (31.7) | 386 (68.3) | 565 (100) | 3.236 (1.608-6.508) |
0.001† |
| Yes | 21 (60) | 14 (40) | 35 (100) | |||
| History of overt Diabetes mellitus | No | 193 (32.8) | 395 (67.2) | 588 (100) | 3.582 (1.036-12.383) |
0.032† |
| Yes | 7 (63.7) | 4 (36.4) | 11 (100) | |||
| Gestational diabetes mellitus | No | 166 (33) | 337 (67) | 503 (100) | 1.096 (0.694-1.730) |
0.695 |
| Yes | 34 (35.1) | 63(64.9) | 97 (100) | |||
| Chronic Hypertension | No | 156 (30.2) | 361 (69.8) | 517 (100) | 2.611 (1.631-4.176) |
<0.001† |
| Yes | 44 (53) | 39 (47) | 83 (100) | |||
| Preeclampsia/eclampsia | No | 166 (30.5) | 378 (69.5) | 544 (100) | 3.519 (1.997-6.201) |
<0.001† |
| Yes | 34 (60.7) | 22 (39.3) | 56 (100) | |||
| Infertility | No | 175 (31.2) | 386 (68.8) | 561 (100) | 3.939 (1.999-7.761) |
<0.001† |
| Yes | 25 (64.1) | 14 (35.9) | 39 (100) | |||
| Place of residence | City | 115 (31.2) | 254 (68.8) | 369 (100) | 1.280 (0.904-1.811) |
0.164 |
| Village | 84 (36.7) | 145 (63.3) | 229 (100) | |||
| Mother’s job | Housekeeper | 194 (33.3) | 388 (66.7) | 582 (100) | 0.833 (0.289-2.399) |
0.735 |
| Employed | 5 (29.4) | 12 (70 .6) | 17 (100) | |||
| Parent’s satisfaction about newborn gender | No | 13 (33.3) | 26 (66.7) | 39 (100) | 1 (0.502-1.991) |
1 |
| Yes | 187 (33.3) | 374 (66.7) | 561 (100) | |||
| Parent’s family relationship | No | 167 (32.2) | 352 (67.8) | 519 (100) | 1.480 (0.914-2.396) |
0.109 |
| Yes | 33 (41.3) | 47 (58.7) | 80 (100) | |||
| Mother’s Anemia | No | 140 (32.3) | 294 (67.7) | 519 (100) | 1.2 (0.824-1.747) |
0.341 |
| Yes | 60 (32.3) | 105 (67.7) | 165 (100) | |||
| Mother’s prenatal care level | Health Center | 152 (32.9) | 310 (67.1) | 462 (100) | 1.1 (0.737-1.643) |
0.642 |
| Gynecologist | 48 (35) | 89 (65) | 137 (100) | |||
| Mother’s reference to the Pregnancy Care Center | Regular | 175 (33.4) | 349 (66.6) | 524 (100) | 0.997 (0.597-1.666) |
0.991 |
| Irregular | 25 (33.3) | 50 (66.7) | 75 (100) | |||
| Mother’s trauma during labor | No | 194 (32.9) | 395 (67.1) | 589 (100) | 3.054 (0.852-10.949) |
0.072 |
| Yes | 6 (60) | 4 (40) | 10 (100) | |||
| History of cervical insufficiency | No | 174 (30.8) | 391 (69.2) | 565 (100) | 7.303 (3.241-16.455) |
<0.001† |
| Yes | 26 (76.5) | 8 (233.5) | 34 (100) | |||
| Age groups | 18-35 years old | 175 (33.8) | 343 (66.2) | 518 (100) | – | – |
| Less than 18 years old | 7 (50) | 7 (50) | 14 (100) | 1.96 (0.677-5.676) |
0.215 | |
| >35 years old | 18 (25.5) | 50 (73.5) | 68 (100) | 0.706 (0.4-1.246) |
0.229 | |
† Statistically Significant