Table 3
Incidence proportion (IP), cumulative incidence ratio (CIR), risk difference (RD) and their corresponding 95% confidence intervals (95% CI) of defaults before the match according to tournament level, surface, sets and round
| no. Default Before | no. Matches | IP (95% CI) | CIR (95% CI) | RD (95% CI) | |
| Tournament level | |||||
| Grand Slam | 2 | 32,723 | 0.06 (0.01–0.22) | Ref. | Ref. |
| Master | 2 | 26,928 | 0.07 (0.01–0.27) | 1.22 (0.17–8.63) | 0.01 (-0.12–0.15) |
| 250 o 500 | 105 | 126,041 | 0.83 (0.68–1.01) | 13.63 (3.36–55.22) | 0.77 (0.59–0.95) |
| Tour Finals | 0 | 532 | 0.00 (0.00–6.91) | N.A. | N.A. |
| Surface | |||||
| Clay | 41 | 64,984 | 0.63 (0.45–0.86) | Ref. | Ref. |
| Grass | 5 | 21,174 | 0.24 (0.08–0.55) | 0.37 (0.15–0.95) | -0.39 (-0.68–0.11) |
| Hard | 24 | 82,575 | 0.29 (0.19–0.43) | 0.46 (0.28–0.76) | -0.34 (-0.57–0.11) |
| Carpet | 39 | 17,491 | 2.23 (1.59–3.05) | 3.53 (2.28–5.48) | 1.60 (0.87–2.32) |
| Round | |||||
| Qualifying | 4 | 25,896 | 0.15 (0.04–0.40) | Ref. | Ref. |
| Preliminary | 85 | 133,166 | 0.64 (0.51–0.79) | 4.13 (1.52–11.26) | 0.48 (0.28–0.69) |
| Final | 20 | 27,162 | 0.74 (0.45–1.14) | 4.77 (1.63–13.94) | 0.58 (0.23–0.94) |
| NA = Not available; Ref = Reference | |||||
