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Table 4 Rate of knee MRI claims by rate of MRI-scanners, adjusted for year and geographic region: linear regression analysis

From: Magnetic resonance imaging of the knee in Norway 2002–2004 (national survey): rapid increase, older patients, large geographic differences

Explanatory variable

Regression coefficient

95 % CI

Rate of MRI-scanners*

744

201, 1287

Year

  

   2002

-2046

-6024, 1931

   2003

-1081

-3490, 1328

   2004 (reference)

0

 

Geographic region

  

   North

-5079

-7887, -2271

   Central

-7234

-9478, -4991

   West

-400

-6242, 5443

   South/East (reference)

0

 
  1. MRI = magnetic resonance imaging.
  2. CI = confidence interval.
  3. * P = 0.017. Intercept (95% CI) = 2003 (-10906, 14913).