Characteristics of mother-infant pairs according to intrapartum colloids and crystalloids exposure for caesarean section
| Missing data | Colloids plus crystalloids | Crystalloids only | |
| No. (%) | No. of deliveries (%) | ||
| 176 (22.0) | 625 (78.0) | ||
| Gestational and maternal variables | |||
| Maternal age in years (mean±SD) | 0 (0) | 29.7 (±4.9) | 29.2 (±5.2) |
| ≤35 | 155 (88.1) | 547 (87.5) | |
| >35 | 21 (11.9) | 78 (12.5) | |
| Gravida | 2 (0.2) | ||
| 1 | 89 (50.9) | 285 (45.7) | |
| 2–4 | 79 (45.1) | 311 (49.8) | |
| ≥5 | 7 (4.0) | 28 (4.5) | |
| Para | 2 (0.2) | ||
| 0 | 104 (59.4) | 363 (58.2) | |
| 1 | 55 (31.4) | 200 (32.0) | |
| ≥2 | 16 (9.2) | 61 (9.8) | |
| Abortus | 2 (0.2) | ||
| 0 | 135 (77.1) | 439 (70.4) | |
| 1 | 33 (18.9) | 128 (20.5) | |
| ≥2 | 7 (4.0) | 57 (9.1) | |
| Cigarette smoking | 2 (0.2) | 21 (11.9) | 105 (16.9) |
| Alcohol drinking | 4 (0.5) | 14 (8.0) | 85 (13.7) |
| Drug use | 4 (0.5) | 6 (3.4) | 24 (3.9) |
| Gestational diabetes | 0 (0) | 5 (2.8) | 38 (6.1) |
| Hypertension during pregnancy | 0 (0) | 9 (5.1) | 41 (6.6) |
| Pre-eclampsia | 0 (0) | 11 (6.3) | 29 (4.6) |
| Epidural before caesarean section | 0 (0) | 53 (30.1) | 272 (43.5) |
| Elective caesarean section | 4 (0.5) | 73 (41.7) | 233 (37.5) |
| Infant-related variables | |||
| Birth weight in grams (mean±SD) | 12 (1.5) | 3383 (±572) | 3449 (±544) |
| Gestational age in weeks (mean±SD) | 12 (1.5) | 38.6 (±1.4) | 39.0 (±1.6) |
| Preterm delivery | 12 (1.5) | 19 (11.1) | 43 (7.0) |
| Low Apgar score (<7) at 1 min | 14 (1.7) | 8 (4.7) | 34 (5.5) |
| Fever during hospitalisation | 14 (1.7) | 4 (2.3) | 11 (1.8) |
| Phototherapy on day 1 | 13 (1.6) | 5 (2.9) | 9 (1.5) |
| Phototherapy on day 2 | 13 (1.6) | 9 (5.2) | 21 (3.4) |
| Phototherapy on day 3 | 14 (1.7) | 18 (10.5) | 36 (5.9) |
| Exclusive breast feeding during hospitalisation | 15 (1.9) | 46 (26.9) | 290 (47.2) |
| Urine during day 1 (mean±SD) | 15 (1.9) | 2.5 (±1.9) | 2.8 (±1.8) |
| Urine during day 2 (mean±SD) | 17 (2.1) | 4.0 (±1.7) | 3.8 (±1.7) |
| Urine during day 3 (mean±SD) | 73 (9.1) | 4.1 (±1.7) | 4.0 (±1.8) |
| Stools during day 1 (mean±SD) | 15 (1.9) | 2.5 (±1.6) | 2.6 (±1.6) |
| Stools during day 2 (mean±SD) | 17 (2.1) | 3.4 (±1.7) | 3.0 (±1.5) |
| Stools during day 3 (mean±SD) | 73 (9.1) | 3.0 (±1.6) | 3.0 (±1.6) |
| Colloids doses in mL* | 1 (0.1) | ||
| 0 | 0 (0) | 625 (78.1) | |
| >0–500 | 47 (5.9) | - | |
| >500 | 128 (16.0) | - | |
| Crystalloids doses in mL | 26 (3.2) | ||
| 0 | 16 (2.1)* | 0 (0) | |
| >0–1000 | 54 (7.0) | 168 (21.7) | |
| >1000–2000 | 84 (10.8) | 320 (41.3) | |
| >2000 | 18 (2.3) | 115 (14.8) | |
| Total intravenous fluid doses in mL | 26 (3.2) | ||
| >0–1000 | 22 (2.8) | 168 (21.7) | |
| >1000–2000 | 102 (13.2) | 320 (41.3) | |
| >2000–3000 | 42 (5.4) | 108 (13.9) | |
| >3000 | 6 (0.8) | 7 (0.9) | |
*Deliveries with missing data on crystalloids doses but available data on colloids doses (16 patients’ records) were included in the colloids plus crystalloids group in the statistical analysis.