Table 3

 Indicators of infant illness severity and infant nurse staffing for duration of unit stay by unit organisational type

Birthweight mean (SD)Gestation mean (SD)Predicted mortality score median (IQ range)Registered nurses median (IQ range)Nurse provision ratio median (IQ range)Specialist nurse provision ratio median (IQ range)
Statistical tests: *one way ANOVA, °Kruskal Wallis, †Mann Whitney U test
Cohort1231.7 (359)29.3 (2.6)0.98 (0.08)4.6 (2.5)0.92 (2.5)1.35 (0.6)
Unit volume type
High1176.4 (344)29 (2.6)0.98 (0.12)6 (1.1)0.93 (0.21)1.41 (0.47)
Medium1257.3 (356)29.3 (2.5)0.99 (0.06)4.3 (2.3)0.94 (0.22)1.33 (0.75)
Low1270.5 (373)29.5 (2.5)0.99 (0.06)3.5 (1.4)0.87 (0.23)1.26 (0.63)
p⩽0.01*p⩽0.01*p⩽0.01°p⩽0.001°p⩽0.001°P⩽0.001°
Unit consultant availability
High1228.9 (351)29.2 (2.6)0.99 (0.05)5.5 (2.6)0.94 (0.22)1.35 (0.62)
Low1234.6 (368)29.3 (2.6)0.98 (0.08)4 (2.2)0.89 (0.25)1.35 (0.58)
p = 0.69*p = 0.82*p = 0.29†p⩽0.001†p⩽0.001†p = 0.42†
Unit nursing establishment
High1230 (355)29.3 (2.6)0.99 (0.08)4.8 (2.8)0.95 (0.21)1.32 (0.55)
Low1234 (364)29.3 (2.6)0.98 (0.09)4.4 (2.2)0.87 (0.21)1.39 (0.67)
p = 0.78*p = 0.72*p = 0.83†p⩽0.001†p⩽0.001†p⩽0.01†