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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).