Table 1

 Mean deviation for each observer from manual grading (graders JC and RTS from Columbia University, USA and graders VS and BL from Kings College Hospital, UK)

ObserverCentral subfieldMiddle subfield
Disagreement in relation to stereo grading (observer manual)95% CIp Value (two sided)Disagreement in relation to stereo grading (observer manual)95% CIp Value (two sided)
JC6.3−4.7 to 170.23−4.6−10.7 to 1.50.12
RTS5.2−6.9 to 170.36−7.5−12.7 to −2.40.01
BL8.5−8 to 250.27−4.1−13.7 to 5.60.36
VS6.8(−9 to 23)0.37−1.3−10.3 to 7.60.73