Table 4.

 Failure to diagnose duct dependent circulation in neonates (1 July 2004 to 31 March 2007) in West Götaland with pulse oximetry screening and in other referring regions not using pulse oximetry. Values are numbers (percentages) of cases of duct dependent circulation unless stated otherwise

Type of duct dependent circulation	West Götaland	Other referring regions	Comparison
Systemic circulation	5/30 (17)	16/48 (33)	P=0.12
Lung and mixing circulation	0/30 (0)	12/52 (23)	P=0.0030
Total	5/60 (8)	28/100 (28)	P=0.0025; relative risk 3.36 (95% CI 1.37 to 8.24)