Indoor | n | Outdoor | n | Treadmill | n | VR | n | Qualitative | n |
---|---|---|---|---|---|---|---|---|---|
Laboratory | 245 | Pavement | 28 | Normal | 52 | VR | 14 | Questionnaire | 32 |
Corridor | 25 | Tarmac | 4 | Multi | 6 | Â | Â | Database | 8 |
Other | 2 | Field | 6 | Â | Â | Â | Â | Focus group | 7 |
Not stated | 4 | Mixed | 18 | Â | Â | Â | Â | Computer | 4 |
 | Not stated | 9 |  |  |  |  |  |  | |
Total | 276 | Â | 65 | Â | 58 | Â | Â | Â | 51 |