Table 4

Knee registries association with revision burden

	Main model		Sensitivity test
	Registry period for non-registry countries
	1999–2018		1994–2018		2003–2018		2006–2018		2012–2018
	Coef.	SE	Coef.	SE	Coef.	SE	Coef.	SE	Coef.	SE
Intercept (β₀)	0.0746***	0.0142	0.0741***	0.0142	0.0756***	0.0142	0.0766***	0.0142	0.0787***	0.0142
Registry country (β₁)	−0.0005	0.0155	−0.0080	0.0155	−0.0010	0.0154	−0.0021	0.0154	−0.0053	0.0154
Registry periods (β₂)	0.0182***	0.0030	0.0127***	0.0032	0.0226***	0.0030	0.0245***	0.0030	0.0210***	0.0037
Trend (β₃)	−0.0003***	0.0001	−0.0002***	0.0001	−0.0003***	0.0001	−0.0003***	0.0001	−0.0002***	0.0001
Registry period of registry countries (β₄)	−0.0163***	0.0033	−0.0123***	0.0034	−0.0198***	0.0032	−0.0217***	0.0033	−0.0204***	0.0040
Hausman test
Test statistics	2.20		2.38		0.68		2.11		2.36
Hausman test p value	0.33		0.30		0.41		0.35		0.31