Classification skills of the study nurses in the pretest
| Intervention (n=658), percentage (n) | Control (n=559), percentage (n) | Significance* | |
| All photographs | 44.6 (5703/12772) | 44.3 (4795/10823) | p=0.82 |
| Normal skin | 95.1 (621/653) | 94.1 (514/546) | p=0.19 |
| Blanchable erythema | 68.8 (440/640) | 68.6 (372/542) | p=0.13 |
| PU grade 1 | 43.8 (840/1917) | 38.2 (620/1625) | p=0.17 |
| PU grade 2 | 45.8 (871/1901) | 52.4 (855/1630) | p=0.11 |
| PU grade 3 | 35.2 (672/1908) | 38.8 (624/1608) | p=0.32 |
| PU grade 4 | 51.8 (996/1924) | 51.7 (841/1626) | p=0.62 |
| IAD | 32.2 (617/1917) | 25.5 (413/1621) | p=0.47 |
| PU/IAD | 33.8 (646/1912) | 34.2 (556/1625) | p=0.21 |
↵* 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.