Model dependent variable LoS at the NICU (days) | Model: dependent variable verall LoS (days) hospital (NICU+level II) | |||
Coefficient of the model with 95% CI | Coefficient of the model with 95% CI | |||
Constant | 14.9 | 12.9 to 16.9 | 48.2 | 45.9 to 50.5 |
Factors | Additional days of admission on top of ‘constant’ | Additional days of admission on top of ‘constant’ | ||
SGA | 2.3 | 0.6 to 3.9 | 7.4 | 2.8 to 12.1 |
Multiplet | 2.0 | 0.6 to 3.5 | ||
Period 2 | −1.2 | −3.1 to −0.8 | 2.0 | −0.9 to 4.9 |
Period 3 | 1.9 | −0.1 to 3.9 | 5.1 | 2.2 to 8.0 |
CLD | 35.2 | 32.4 to 38.1 | 30.5 | 26.6 to 34.4 |
NECs | −2.2 | −11.7 to 7.8 | −4.2 | −15.6 to 7.3 |
PHVD intervention | 18.4 | 11.7 to 25.0 | 14.3 | 7.1 to 21.6 |
ROP intervention | 38.1 | 31.1 to 45.1 | 29.6 | 22.0 to 37.3 |
Late-onset sepsis | 5.2 | 3.5 to 6.9 | 5.9 | 3.6 to 8.1 |
Discharge to post-IC/HC department | −3.2 | −4.6 to −1.7 | ||
Extra days CLD period 2 | 4.4 | 0.9 to 7.9 | 9.1 | 4.3 to 13.9 |
Extra days CLD period 3 | 5.5 | 1.9 to 9.1 | 8.2 | 3.3 to 13.1 |
Extra days NECs period 2 | 16.5 | 4.4 to 28.6 | 34.1 | 20.4 to 47.7 |
Extra days NECs period 3 | 5.8 | −5.9 to 17.5 | −0.9 | −14.8 to 12.9 |
Extra days SGA period 2 | −6.3 | −12.0 to −0.5 | ||
Extra days SGA period 3 | −7.9 | −13.9–−1.9 |
Model LoS at the NICU.
LoS (days)=14.9+(2.3*SGA)+(2.0*Multiplet)+(−1.2*Period 2)+(1.9*Period 3)+(5.2*late-onset sepsis)+(−2.2*necrotising encerocolitis with laparotomy)+(16.5*Period 2*necrotising encerocolitis with laparotomy)+(5.8*Period 3*necrotising encerocolitis with laparotomy)+(18.4*PHVD with intervention)+(35.2*CLD)+(4.4*Period 2*CLD)+(5.5*Period 3*CLD)+(38.1*ROP with intervention)+(−3.2*discharge to post-IC/HC).
Model overall LoS.
LoS (days)=48.2+(7.4*SGA)+(−6.3*Period 2*SGA)+(−7.9*Period 3*SGA)+(2.0*Period 2)+(5.1*Period 3)+(5.9*late-onset sepsis)+(−4.2*necrotising encerocolitis with laparotomy)+(34.0*Period 2*necrotising encerocolitis with laparotomy)+(−0.9*Period 3*necrotising encerocolitis with laparotomy)+(14.3*PHVD with intervention)+(30.5*CLD)+(9.1*Period 2*CLD)+(8.2*Period 3*CLD)+(29.6*ROP with intervention).
CLD, chronic lung disease; IC/HC, intensive care/high care; LoS, length of stay; NEC, necrotising enterocolitis with indication for surgery; NICU, neonatal intensive care unit; PHVD, posthaemorrhagic ventricle dilatation; ROP, retinopathy of prematurity; SGA, small for gestational age.