Table 3.
Results of the randomisation procedure.
| Number of patients | ||||
| Factor | Level | Hospital | Home | Total |
| Hospital | UMC Utrecht | 24 | 25 | 49 |
| Hilversum Hospital | 14 | 15 | 29 | |
| Academic Hospital Maastricht | 9 | 9 | 18 | |
| Diakonessen Hospital Utrecht | 9 | 8 | 17 | |
| Meander Hospital Amersfoort | 7 | 8 | 15 | |
| Groene Hart Hospital Gouda | 6 | 5 | 11 | |
| AMC Amsterdam | 5 | 5 | 10 | |
| Erasmus MC Rotterdam | 5 | 4 | 9 | |
| VUmc Amsterdam | 4 | 5 | 9 | |
| Gelre Hospital Apeldoorn | 5 | 3 | 8 | |
| Diakonessen Hospital Zeist | 3 | 4 | 7 | |
| Reinier de Graaf Hospital Delft/Voorburg | 4 | 3 | 7 | |
| AntoniusMesosGroup Hospitals Nieuwegein/Utrecht | 2 | 2 | 4 | |
| Lucas Andreas Hospital Amsterdam | 1 | 2 | 3 | |
| Previous UV phototherapy | Yes | 50 | 50 | 100 |
| No | 48 | 48 | 96 | |
Stratified randomisation, in particular the minimisation method described by Pocock [19] was used, which took into account (1) the recruiting hospital, and (2) possible previous experience of the patient with UV therapy. This table shows the results of the treatment assignment by the two factors for 196 patients.