Table 1

Background variables by group: unmatched and matched cohorts

VariableUnmatched cohortMatched cohort
No parenteral nutritionParenteral nutritionNo parenteral nutritionParenteral nutrition
N4535147512401240
Male
 N (%)2507 (55.3)810 (54.9)652 (52.6)664 (53.5)
Gestational age at birth (weeks)
 Mean (SD)39.4 (1.6)39.4 (1.6)39.4 (1.6)39.4 (1.6)
Birth weight (g)
 Mean (SD)3385 (621)3321 (631)3330 (609)3328 (628)
Caesarean delivery
 N (%)2066 (47.7)667 (47.1)545 (45.9)549 (46.1)
Maternal age
 Median (IQR)30 (26–35)31 (26–34)30 (26–34)31 (26–34)
Maternal suspected chorioamnionitis
 N (%)479 (12.8)175 (14.5)147 (14.5)150 (14.6)
Smoking in pregnancy
 Yes N (%)520 (13.3)211 (16.9)175 (16.6)176 (16.8)
 Missing N (%)620 (15.8)227 (18.2)187 (17.8)189 (18.0)
Ethnicity (maternal)
 White, %65.761.480.879.9
 Asian and Mixed, %11.26.87.97.5
 Black and Mixed, %7.54.34.35.0
 Other and missing, %15.527.56.97.6
Maternal diabetes
 N (%)191 (4.2)65 (4.4)49 (4.0)53 (4.3)
Maternal deprivation score
 In deciles 1 or 2, %27.922.323.921.7
Primiparous
 N (%)2425 (53.5)778 (52.7)669 (54.0)671 (54.1)
Umbilical cord arterial pH
 >7.0, N (%)1439 (44.4)451 (44.0)396 (45.3)396 (45.3)
 6.9–7.0, N (%)756 (23.3)248 (24.2)198 (22.7)198 (22.7)
 <6.9, N (%)1049 (32.3)326 (31.8)280 (32.0)280 (32.0)
 Missing N (%)1291 (28.5)450 (30.5)366 (29.5)366 (29.5)
Apgar 5 min
 0–1 (%)730 (16.1)218 (14.8)188 (15.1)182 (14.7)
 2–4 (%)1704 (37.6)563 (38.2)450 (36.2)470 (37.9)
 5–7 (%)1372 (30.3)433 (29.4)389 (31.3)362 (29.2)
 8–10 (%)374 (8.2)130 (8.8)107 (8.6)116 (9.4)
 Missing (%)355 (7.8)131 (8.9)107 (8.6)109 (8.8)
Received chest compressions at resuscitation
 N (%)1705 (37.6)523 (35.5)431 (34.8)427 (34.4)
Received resuscitation drugs
 N (%)719 (15.9)206 (14.0)176 (14.2)172 (13.9)
Intubated at resuscitation
 N (%)2925 (64.5)935 (63.4)784 (63.2)783 (63.1)
Mechanical ventilation on day of admission
 N (%)3508 (80.2)1122 (79.5)951 (79.6)956 (80.2)
Treatment with inotropes on day of admission
 N (%)1126 (26.0)335 (23.9)295 (25.0)287 (24.2)
  • N, number.