Table 3.

Concordance between clinicians when using Humphrey printouts

Concordance among clinicians	Series classified as progressing	Series classified as stable	Total
100%	5	5	10 (37%)
80%	2	6	8 (30%)
60%	6	3	9 (33%)
Total	13	14	27 (100%)

Categories were collapsed into progressing (probably and definitely) and stable (probably and definitely). 100% concordance represents exact agreement among all five clinicians, 80% concordance represents exact agreement among four clinicians, and 60% concordance represents exact agreement among three clinicians.