Table 1.
Demographic data of the patients.
| Variables | (n = 144) | AKI | NAKI | Total |
|---|---|---|---|---|
| (n = 460) | (n = 604) | |||
| Age (h) | N | 144 | 460 | 604 |
| Median (range) | 2.4 (0.5, 70.3) | 2.3 (0.3, 72) | 2.3 (0.3, 72) | |
| Gestational age (week) | N | 144 | 457 | 601 |
| Median (range) | 29.1 (25.1, 36.3) | 30.9 (24.9, 40.3) | 30.3 (24.9, 40.3) | |
| Birth weight (g) | N | 144 | 460 | 604 |
| Median (range) | 1,240 (600, 1,490) | 1,320 (550, 1,495) | 1,300 (550, 1,495) | |
| Apgar 5 | N | 137 | 437 | 574 |
| Median (range) | 8 (2, 10) | 9 (1, 10) | 9 (1, 10) | |
| Maternal age (year) | <35 years | 115 (79.9%) | 385 (84.1%) | 500 (83.1%) |
| ≥35 years | 29 (20.1%) | 73 (15.9%) | 102 (16.9%) | |
| Sex of infant | Female | 61 (42.4%) | 238 (51.7%) | 299 (49.5%) |
| Male | 83 (57.7%) | 222 (48.3%) | 305 (50.5%) | |
| Type of delivery | Normal delivery | 95 (66.0%) | 220 (47.9%) | 315 (52.2%) |
| Cesarean section | 49 (34.0%) | 239 (52.1%) | 288 (47.8%) | |
| RBC (×1012/L) | N | 143 | 459 | 602 |
| Mean (SD) | 4.1 (0.7) | 4.4 (0.7) | 4.4 (0.7) | |
| Hb (g/L) | N | 143 | 459 | 602 |
| Median (range) | 330 (284.5, 368.5) | 336 (283, 411) | 334.5 (283, 411) | |
| UN (mmol/L) | N | 144 | 458 | 602 |
| Median (range) | 3.9 (1, 12.3) | 3.7 (1.1, 19.6) | 3.7 (1, 19.6) | |
| CysC (mg/L) | N | 35 | 76 | 111 |
| Mean (SD) | 2 (0.4) | 1.9 (0.3) | 1.9 (0.3) | |
| P (mmol/L) | N | 144 | 459 | 603 |
| Median (range) | 2.2 (1, 5.4) | 2.1 (0.8, 4.3) | 2.1 (0.8, 5.4) | |
| Ca (mmol/L) | N | 144 | 459 | 603 |
| Median (range) | 1.9 (0.9, 2.5) | 2.1 (1, 2.8) | 2 (0.9, 2.8) | |
| Respiratory failure | – | 22 (15.5%) | 165 (36.7%) | 187 (31.6%) |
| + | 120 (84.5%) | 285 (63.3%) | 405 (68.4%) | |
| Sepsis | – | 54 (38.0%) | 235 (52.2%) | 289 (48.8%) |
| +− | 20 (14.1%) | 63 (14%) | 83 (14.0%) | |
| + | 68 (47.9%) | 152 (33.8%) | 220 (37.2%) | |
| Brain injury | – | 110 (77.5%) | 385 (85.6%) | 495 (83.6%) |
| + | 32 (22.6%) | 65 (14.4%) | 97 (16.4%) | |
| Pulmonary hypertension | – | 67 (47.2%) | 336 (74.7%) | 403 (68.1%) |
| + | 75 (52.8%) | 114 (25.3%) | 189 (31.9%) | |
| PDA | – | 33 (23.2%) | 213 (47.3%) | 246 (41.6%) |
| + | 109 (76.8%) | 237 (52.7%) | 346 (58.5%) | |
| Myocardial injury | – | 46 (32.4%) | 217 (48.2%) | 263 (44.4%) |
| + | 96 (67.6%) | 233 (51.8%) | 329 (55.6%) | |
| Neonatal hyperbilirubinemia | – | 31 (21.8%) | 137 (30.4%) | 168 (28.4%) |
| + | 111 (78.2%) | 313 (69.6%) | 424 (71.6%) | |
| NEC | – | 111 (78.2%) | 369 (82.0%) | 480 (81.1%) |
| +− | 19 (13.4%) | 51 (11.3%) | 70 (11.8%) | |
| + | 12 (8.5%) | 30 (6.7%) | 42 (7.1%) | |
| Neonatal asphyxia | – | 77 (53.47%) | 282 (61.3%) | 359 (59.44%) |
| + | 65 (45.14%) | 168 (36.52%) | 233 (38.58%) |
+, yes; –, no; +−, suspected.
AKI, acute kidney injury; NAKI, non-acute kidney injury; N, number; Apgar 5, 5-min Apgar score; RBC, red blood cell count within 3 days of birth; Hb, hemoglobin concentration within 3 days of birth; UN, urea nitrogen within 3 days of birth; CysC, serum cystatin C within 3 days of birth; P, phosphorus concentration within 3 days of birth; Ca, calcium concentration within 3 days of birth; PDA, patent ductus arteriosus; NEC, necrotizing enterocolitis.