Table 1

Estimated game hours and incidence rates (IRs) from different methods of imputation

MethodsMean 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)PoissonZero-inflatedNegative binomial
Available cases40.95 (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)
LOCF48.47 (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 imputation46.40 (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 imputation48.65 (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 + Imputation48.52 (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/Worst55.26 (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).