Table 4
Incidence proportion (IP), cumulative incidence ratio (CIR), risk difference (RD) and their corresponding 95% confidence intervals (95% CI) of defaults during the match according to tournament level, surface, sets and round
| no. Default During | no. Matches | IP (95% CI) | CIR (95% CI) | RD (95% CI) | |
| Tournament level | |||||
| Grand Slam | 6 | 32,723 | 0.18 (0.07–0.40) | Ref. | Ref. |
| Master | 9 | 26,928 | 0.33 (0.15–0.63) | 1.82 (0.65–5.12) | 0.15 (-0.11–0.41) |
| 250 o 500 | 42 | 126,041 | 0.33 (0.24–0.45) | 1.82 (0.77–4.27) | 0.15 (-0.03–0.33) |
| Tour Finals | 0 | 532 | 0.00 (0.00–6.91) | N.A. | N.A. |
| Surface | |||||
| Clay | 17 | 64,984 | 0.26 (0.15–0.42) | Ref. | Ref. |
| Grass | 5 | 21,174 | 0.24 (0.08–0.55) | 0.90 (0.33–2.45) | -0.03 (-0.27–0.22) |
| Hard | 28 | 82,575 | 0.34 (0.23–0.49) | 1.30 (0.71–2.37) | 0.08 (-0.10–0.25) |
| Carpet | 7 | 17,491 | 0.40 (0.16–0.82) | 1.53 (0.63–3.69) | 0.14 (-0.18–0.46) |
| Round | |||||
| Qualifying | 5 | 25,896 | 0.19 (0.06–0.45) | Ref. | Ref. |
| Preliminary | 39 | 133,166 | 0.29 (0.21–0.40) | 1.52 (0.60–3.85) | 0.10 (-0.09–0.29) |
| Final | 13 | 27,162 | 0.48 (0.25–0.82) | 2.48 (0.88–6.95) | 0.29 (-0.02–0.60) |
| NA = Not available; Ref = Reference | |||||
