Table 2.

Patient demographics with mean testing for infants who did and did not experience AKI

CharacteristicAll Patients (n=455)AKI (n=181)No AKI (n=274)P
Mean (SD)RangeMean (SD)RangeMean (SD)Range
Gestational age (wk)27.7 (3)22–3725.7 (2.4)22–3329.0 (2.6)24–37<0.001
Birth weight (g)1016 (296)370–1495816 (253)370–14701148 (245)400–1495<0.001
Sex (% boys)5154490.33
Apgar (1 min)4.9 (2.7)0–94.0 (2.6)0–95.4 (2.5)0–9<0.001
Apgar (5 min)6.9 (2.0)0–96.0 (2.2)0–97.4 (1.7)2–9<0.001
SGA (%)2214260.002
CRIB II scorea9.5 (3.9)2–1912.1 (3.6)3–197.6 (3.0)2–17<0.001
Length of stay (d)68 (41)3–30795 (69–114)b3–30746 (31–69)b3–175<0.001
Initial creatinine (mg/dl)0.74 (0.14)0.4–1.50.76 (0.15)0.4–1.10.72 (0.13)0.5–1.50.001
Mortality (%)8143<0.001
  • SGA, small for gestational age; CRIB II, updated clinical risk index for babies score.

  • a CRIB II scores were missing in 18.5% of patients. For all patients, n=371. For patients with AKI, n=157. For patients with no AKI, n=214.

  • b All results are reported as mean and SD except length of stay, which is reported as median and interquartile range.