Table 2.

The association between early AKI and length of stay (d), assessing the overall cohort and by gestational age cohorts (22–28, 29–35, ≥36 wk)

VariableNon-AKI (mean±SD)AKI (mean±SD)Unadjusted Difference (d) (95% CI)P ValueaAdjusted Difference (d) (95% CI)P Valueb
Overall cohort29±2932±332.4 (−0.8 to 5.5)0.147.3 (4.7 to 10.0)<0.001
22–28 wk78±3576±41−1.9 (−8.2 to 4.5)0.566.5 (0.4 to 12.6)0.04
29–35 wk28±2230±241.2 (−3.2 to 5.6)0.593.7 (−0.5 to 7.9)0.08
≥36 wk16±1919±212.8 (−0.6 to 6.3)0.114.9 (1.6 to 8.2)0.004
  • Unadjusted and adjusted differences are shown as parameter estimates.

  • a On the basis of general linear regression.

  • b Linear regression adjusted for early AKI, positive pressure ventilation, intubation, sepsis, seizures/hypoxic ischemic encephalopathy, admission for necrotizing enterocolitis, admission for omphalocele, size for gestational age, intrauterine growth restriction, hydramnios, multiple gestation, meconium, steroids for fetal maturation, 1-min Apgar, 5-min Apgar, exposure to nephrotoxins, methylxanthines, diuretics, nonsteroidal anti-inflammatory medications, and admission for other reasons.