Table 2.

Calculated Completeness with Different Reference Data from the National Patient Register (NPR)

	Reference Data from the NPR	Number of Registrations	True Fractures Missing	Formula for Completeness	Completeness (%)
NPR	All registrations	2173	51	2173/(1324+849+51)	97.7
	True number of humeral fractures	1513	51	1513/(1324+189+51)	96.7
	Adjusted registrations in the NPR*	1648	51	1648/(1324+324+51)	97.0
SFR	All registrations	1375	189	1375/(1324+51+849)	61.8
	True number of humeral fractures	1375	189	1375/(1324+51+189)	87.9
	Adjusted registrations in the NPR*	1375	189	1375/(1324+51+324)	80.9

Note: *Adjustment algorithm used on NPR data for routine completeness calculations in the SFR.

Abbreviation: SFR, Swedish Fracture Register.