Estimated game hours and incidence rates (IRs) from different methods of imputation
| Methods | Mean of total game hours (95% CI) | IR per 1000 h (95% CI) | Injury rate ratio AB/QC (IRR) (95% CI) | ||||
|---|---|---|---|---|---|---|---|
| AB (n=1061) | QC (n=1037) | AB (n=1061) | QC (n=1037) | Poisson | Zero-inflated | Negative binomial | |
| Available cases | 40.95 (40.19 to 41.70) | 46.09 (45.21 to 46.97) | 4.72 (3.89 to 5.72) | 1.44 (1.10 to 1.89) | 3.27 (2.35 to 4.55) | 3.03 (2.16 to 4.25) | 3.31 (2.37 to 4.62) |
| LOCF | 48.47 (47.63 to 49.31) | 52.51 (51.51 to 53.50) | 3.99 (3.29 to 4.83) | 1.27 (0.97 to 1.66) | 3.15 (2.26 to 4.39) | 2.96 (2.11 to 4.14) | 3.18 (2.28 to 4.45) |
| Mean imputation | 46.40 (45.63 to 47.17) | 52.83 (51.84 to 53.82) | 4.16 (3.44 to 5.04) | 1.26 (0.96 to 1.65) | 3.31 (2.37 to 4.61) | 3.02 (2.15 to 4.26) | 3.34 (2.39 to 4.67) |
| Multiple imputation | 48.65 (46.08 to 50.34) | 52.85 (50.77 to 55.21) | 3.97 (3.28 to 4.81) | 1.26 (0.96 to 1.65) | 3.16 (2.26 to 4.41) | 2.97 (2.12 to 4.17) | 3.18 (2.27 to 4.46) |
| Bootstrap + Imputation | 48.52 (48.06 to 48.99) | 52.83 (52.33 to 53.40) | 3.99 (3.43 to 4.57) | 1.26 (0.97 to 1.57) | 3.22 (2.45 to 4.25) | 3.03 (2.29 to 3.98) | 3.24 (2.47 to 4.29) |
| Best/Worst | 55.26 (54.17 to 56.34) | 48.24 (47.31 to 49.17) | 3.50 (2.88 to 4.24) | 1.38 (1.05 to 1.81) | 2.54 (1.82 to 3.54) | 2.68 (1.91 to 3.77) | 2.56 (1.83 to 3.59) |
AB, Alberta (body checking allowed in Pee Wee).; LOCF, last observation carried forward; QC, Quebec (body checking not allowed in Pee Wee).