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 1 Descriptive statistics, before and after the introduction of n-BiPAP treatment at Ahus stratified by gestational age groups

	Ahus before November 1st 2008 (a)	Ahus after October 31st 2008 (b)	All hospitals but Ahus before November 1st 2008 (c)	All hospitals but Ahus after October 31st 2008 (d)	Difference in difference (b-a)-(d-c)
Preterm infants <28 weeks (N =989)
	Fraction	Fraction	Fraction	Fraction	(b-a)-(d-c)
BPD	0.313	0.094	0.243	0.116	-0.091
ROP	0.063	0.000	0.106	0.184	-0.141
IVH	0.063	0.038	0.244	0.168	0.051
Combined morbidity	0.375	0.151	0.502	0.421	-0.144
In-hospital death	0.107	0.075	0.268	0.221	0.015
	Mean	Mean	Mean	Mean	(b-a)-(d-c)
NHD	47.964	18.585	37.282	34.116	-26.213
DRG	10.729	6.709	13.066	13.842	-4.796
N	112	53	634	190
Preterm infants 28-37 weeks (N =13209)
	Fraction	Fraction	Fraction	Fraction	(b-a)-(d-c)
BPD	0.023	0.006	0.016	0.009	-0.010
ROP	0.004	0.006	0.013	0.025	-0.010
IVH	0.010	0.006	0.019	0.016	-0.001
Combined morbidity	0.032	0.017	0.044	0.046	-0.018
In hospital death	0.004	0.009	0.015	0.014	0.006
	Mean	Mean	Mean	Mean	(b-a)-(d-c)
NHD	17.246	16.494	15.573	15.175	-0.354
DRG	4.939	5.130	5.097	5.609	-0.321
N	1680	538	8290	2701
Term infants with respiratory symptoms (N =10270):
	Mean	Mean	Mean	Mean	(b-a)-(d-c)
NHD	8.433	4.913	7.332	6.916	-3.104
DRG	2.009	1.431	1.767	2.253	-1.064
N	1082	482	6646	2060

Patent ductus arteriousus (PDA), Bronchopulmonary dysplasia (BPD), Retinopathy of prematurity (ROP), Intraventricular hemorrhage (IVH), Number of hospital days (NHD), Nasal biphasic positive airway pressure (n-BiPAP), Akershus University Hospital (Ahus).

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