Economic and health consequences of non-invasive respiratory support in newborn infants: a difference-in-difference analysis using data from the Norwegian patient registry

Table 3 Estimated effect on costs and number of hospital days, stratified by gestational age

	Ordinary least square regression		Ordinary least square regression
	Log transformed
	Number of hospital days	DRG points	Number of hospital days	DRG points
Preterm infants <28 weeks (N =989):
DID-estimate	-0.861*	-0.482*	-26.60*	-5.428***
95% CI	[-1.565,-0.157]	[-0.931,-0.0326]	[-47.46,-5.738]	[-8.344,-2.513]
N	989	989	989	989
R-sq	0.076	0.095	0.076	0.115
Preterm infants 28-37 weeks (N =13209):
DID-estimate	-0.05	0.017	-1.656	-0.266
95% CI	[-0.242,0.142]	[-0.078,0.113]	[-4.839,1.527]	[-0.787,0.254]
N	13209	13209	13209	13209
R-sq	0.322	0.206	0.327	0.323
Term infants - with respiratory problems (N =10270):
DID-estimate	-0.257**	-0.326***	-3.023**	-1.288***
	[-0.443,-0.0705]	[-0.443,-0.209]	[-5.113,-0.933]	[-1.897,-0.680]
N	10270	10270	10270	10270
R-sq	0.07	0.172	0.078	0.21

The results are adjusted for weight, gender, patent ductus arteriosus and whether or not the admission was planned.
*p <0.05, **p <0.01, ***p <0.001, confidence intervals in brackets.
Difference-in-difference (DID), Confidence interval (CI).

ISSN: 1472-6963