From: Photographic measurement of upper-body sitting posture of high school students: A reliability and validity study
Limits of agreement ± 2 SD
Sagittal head angle
-7.04–3.93
Cervical angle
-8.04–6.73
Protraction/retraction angle
-11.45–15.41
Thoracic angle
-8.61–6.37
Arm angle
-10.84–3.32