Classification skills of the study nurses in the post-test
| Intervention (n=658), percentage (n) | Control (n=559), percentage (n) | Significance* | OR (95% CI) | |
| Identical photographs from pretest (n=20) | ||||
| All photographs | 62.8 (8073/12860) | 53.0 (5804/10944) | p<0.0001 | 1.50 (1.40 to 1.61) |
| Normal skin | 95.1 (619/651) | 94.5 (519/549) | p=0.18 | 1.56 (0.81 to 3.02) |
| Blanchable erythema | 83.0 (539/649) | 77.1 (420/545) | p=0.59 | 0.91 (0.65 to 1.28) |
| PU grade 1 | 52.0 (995/1914) | 51.5 (844/1639) | p=0.10 | 1.65 (0.61 to 4.44) |
| PU grade 2 | 66.9 (1292/1931) | 62.5 (1025/1639) | p=0.84 | 0.98 (0.82 to 1.18) |
| PU grade 3 | 46.3 (892/1926) | 49.0 (804/1642) | p=0.09 | 1.15 (0.98 to 1.36) |
| PU grade 4 | 63.9 (1242/1945) | 62.1 (1021/1644) | p=0.15 | 1.39 (0.50 to 3.83) |
| IAD | 71.2 (1371/1926) | 34.8 (574/1652) | p<0.0001 | 3.62 (2.87 to 4.56) |
| PU/IAD | 58.6 (1123/1918) | 36.5 (597/1634) | p<0.0001 | 1.86 (1.57 to 2.22) |
| Different photographs from pretest (n=20) | ||||
| All photographs | 63.7 (8205/12879) | 53.2 (5833/10956) | p<0.0001 | 1.35 (1.26 to 1.45) |
| Normal skin | 96.5 (630/653) | 95.6 (527/551) | p=0.42 | 1.27 (0.71 to 2.26) |
| Blanchable erythema | 81.4 (526/646) | 81.1 (443/546) | p=0.02 | 1.46 (1.05 to 2.03) |
| PU grade 1 | 55.0 (1060/1926) | 46.5 (762/1639) | p=0.07 | 0.86 (0.74 to 1.01) |
| PU grade 2 | 66.7 (1291/1935) | 66.0 (1090/1651) | p=0.0004 | 1.37 (1.15 to 1.62) |
| PU grade 3 | 46.9 (904/1926) | 45.0 (736/1636) | p=0.01 | 0.82 (0.70 to 0.96) |
| PU grade 4 | 67.7 (1314/1940) | 61.0 (1006/1648) | p=0.53 | 1.07 (0.39 to 2.93) |
| IAD | 70.2 (1360/1937) | 35.8 (589/1647) | p<0.0001 | 4.07 (3.21 to 5.15) |
| PU/IAD | 58.5 (1120/1916) | 41.5 (680/1638) | p<0.0001 | 2.08 (1.73 to 2.50) |
↵* Adjusted for country, educational level, work experience and accounting for clustering of photos within nurses.
IAD, incontinence-associated dermatitis; PU, pressure ulcer; PU/IAD, combination of pressure ulcer and incontinence-associated dermatitis.