Table 3.

Univariable linear regression predicting costs by country

	Adjusted R2	B	SE	β	t	p value
Total cost of surgery – all countries
Year	−0.017	−531.16	640.11	−0.192	−0.830	0.418
Total cost of surgery – USA
Year	0.385	−1,774.24	1,293.72	−0.621	−1.371	0.264
Total cost of treatment – all countries
Year	0.049	−1,262.83	899.39	−0.314	−1.404	0.177
Total cost of treatment – USA
Year	0.734	−6,319.99	1,820.49	−0.895	−3.472	0.040