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Official Journal of the Italian Society of Orthopaedics and Traumatology

Table 5 Comparison of k coefficient values for interobserver agreement

From: Reliability and reproducibility of the new AO/OTA 2018 classification system for proximal humeral fractures: a comparison of three different classification systems

Classification system

Mean k values

Difference in k

95% CI

p-Value

Neer versus AO/OTA 2007

0.670 versus 0.569

0.101

0.448–0.891

< 0.05

AO/OTA 2018 versus Neer

0.673 versus 0.670

0.003

0.413–0.891

> 0.05

AO/OTA 2018 versus AO/OTA 2007

0.673 versus 0.569

0.104

0.448–0.881

< 0.05

AO/OTA 2018 versus AO/OTA 2018 (with universal modifiers)

0.673 versus 0.640

0.033

0.382–0.881

> 0.05

  1. Data acquired from interobserver testing from mean k values of two readings (Tables 1, 2, 3, and 4)