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Table 2 Mean biases, confidence intervals, P values in two statistical tests, fixed or proportional biases for different methods’ measurements

From: Endodontic length measurements using 3D Endo, cone-beam computed tomography, and electronic apex locator

Groups

Paired t-test

Linear regression

Fixed bias

Proportional bias

Mean bias

95% CI

P

P

3D-PL–AL

0.1076

0.0701 to 0.1451

< 0.0001*

0.6565

Yes

No

3D-CL–AL

− 0.0056

− 0.0386 to 0.0274

0.7375

0.2291

No

No

Romexis Viewer–AL

0.0383

− 0.0218 to 0.0986

0.2112

0.6357

No

No

ProPex II–AL

− 0.1815

− 0.1869 to − 0.1761

< 0.0001*

0.5733

Yes

No

  1. *Differences at a significant level of 0.0001, Paired t-test