Table 1.
Associated factors to epidural analgesia that can be presented as potential confounding factors in population 1.
| Variables | Epidural Analgesia | p-Value | |
|---|---|---|---|
| No (n = 503) | Yes (n = 2441) | ||
| Maternal Age | 0.665 | ||
| Mean (SD) | 30.8 (5.67) | 30.7 (5.20) | |
| Gestational Age | <0.001 | ||
| Mean (SD) | 39.5 (1.07) | 39.8 (1.06) | |
| Parity | <0.001 | ||
| Nulliparous | 112 (22.3) | 1348 (55.2) | |
| Multiparous | 391 (77.7) | 1093 (44.8) | |
| Previous CS | 0.137 | ||
| No | 478 (95.0) | 2276 (93.2) | |
| Yes | 25 (5.0) | 165 (6.8) | |
| BMI | |||
| Mean (SD) | 24.7 (4.60) | 24.4 (4.54) | 0.579 |
| Newborn weight (grams) | 0.051 | ||
| Mean (SD) | 3271.8 (444.82) | 3313.8 (412.01) | |
| First stage of labor duration (minutes) | <0.001 | ||
| Mean (SD) | 94.4 (97.19) | 270.5 (161.56) | |
| Second stage of labor duration (minutes) | <0.001 | ||
| Mean (SD) | 19.3 (23.12) | 78.4 (63.37) | |
| Type of delivery | <0.001 | ||
| Normal Vaginal | 503 (100.0) | 2006 (82.2) | |
| Instrumental | 0 (0.0) | 194 (7.9) | |
| Emergency CS | 0 (0.0) | 241 (9.9) | |
BMI = Body Mass Index; CS = Caesarean Section; EA = Analgesia Epidural; SD = Standard Deviation.