Assessments of the colour of the tubes with various extinctions (E) of bilirubin by clinicians and students compared with spectrophotometry
| E = 0.00* | E = 0.01 | E = 0.02 | E = 0.04 | E = 0.06 | E = 0.07 | E = 0.09 | |
|---|---|---|---|---|---|---|---|
| The cut off point for positive extinction is 0.05. Percentages are given in parentheses. | |||||||
| *One tube was not assessed. | |||||||
| Clinicians | |||||||
| Colourless | 50 (100%) | 35 (69%) | 36 (71%) | 2 (4%) | 0 (0%) | 0 (0%) | 0 (0%) |
| Doubt | 0 (0%) | 9 (18%) | 10 (20%) | 22 (43%) | 6 (12%) | 1 (2%) | 0 (0%) |
| Yellow | 0 (0%) | 7 (14%) | 5 (10%) | 27 (53%) | 45 (88%) | 50 (98%) | 51 (100%) |
| Yellow including doubt | 0 (0%) | 16 (31%) | 15 (29%) | 49 (96%) | 51 (100%) | 51 100%) | 51 (100%) |
| Medical students | |||||||
| Colourless | 47 (92%) | 38 (75%) | 37 (73%) | 15 (29%) | 1 (2%) | 0 (0%) | 0 (0%) |
| Doubt | 1 (2%) | 10 (20%) | 11 (22%) | 19 (37%) | 4 (8%) | 2 (4%) | 2 (4%) |
| Yellow | 3 (6%) | 3 (6%) | 3 (6%) | 17 (33%) | 46 (90%) | 49 (96%) | 49 (96%) |
| Yellow including doubt | 4 (8%) | 13 (25%) | 14 (27%) | 36 (71%) | 50 (98%) | 51 (100%) | 51 (100%) |
| Overall % colourless | 95% | 72% | 72% | 17% | 1% | 0% | 0% |
| Overall % yellow | 3% | 10% | 8% | 43% | 89% | 97% | 98% |
| Overall % yellow including doubt | 4% | 28% | 28% | 83% | 99% | 100% | 100% |