Inter- and intra-rater reliability of vertebral fracture classifications in the Swedish fracture register

Abstract

AIM: To investigate the inter- and intra-rater reliability of the vertebral fracture classifications used in the Swedish fracture register. METHODS: = 50). Cohen's kappa was used to calculate the inter- and intra-rater reliability. RESULTS: The mean kappa coefficient for inter-rater reliability ranged between 0.54 and 0.79 for the cervical fracture classifications, between 0.51 and 0.72 for the thoracolumbar classifications (overall and for different sub classifications), and between 0.65 and 0.77 for the presence or absence of signs of ankylosing disorder in the fracture area. The mean kappa coefficient for intra-rater reliability ranged between 0.58 and 0.80 for the cervical fracture classifications, between 0.46 and 0.68 for the thoracolumbar fracture classifications (overall and for different sub classifications) and between 0.79 and 0.81 for the presence or absence of signs of ankylosing disorder in the fracture area. CONCLUSION: The classifications used in the Swedish fracture register for vertebral fractures have an acceptable inter- and intra-rater reliability with a moderate strength of agreement.