From: Concurrent validity and reliability of measuring range of motion during the cervical flexion rotation test with a novel digital goniometer
Limiting factor
Kappa
p
Stiffness
Neck pain
Headache
Jaw pain
FRT right
Examiner 1
36
13
1
0
0.85
< 0.001
Examiner 2
37
12
FRT left
39
10
0.89