Characteristics of the participating sports clubs (n=16)
| No of sports clubs n=16 | With an outdoor SFP n=8 | Without an outdoor SFP n=8 | |
| Sports | |||
| Soccer | 5 | 2 | 3 |
| Korfball | 4 | 2 | 2 |
| Field hockey | 4 | 2 | 2 |
| Tennis | 3 | 2 | 1 |
| Size (members) | |||
| <250 | 4 | 1 | 3 |
| 250–500 | 3 | 3 | 0 |
| 500–1000 | 6 | 3 | 3 |
| 1000–1500 | 3 | 1 | 2 |
| Level of urbanity | |||
| Highly urbanised | 3 | 2 | 1 |
| Urbanised | 4 | 3 | 1 |
| Moderately urbanised | 2 | 1 | 1 |
| Rural | 6 | 2 | 4 |
| Highly rural | 1 | 0 | 1 |
SFP, smoke-free policy.