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Table 1 Descriptive statistics for the demographic, performance, and injury variables

From: Models to predict injury, physical fitness failure and attrition in recruit training: a retrospective cohort study

Item28-day Reservist Course80-day Standard Course
FemalesMalesFemalesMales
aAge [year, mean ± SD (n)]25.3 ± 7.4(1001)24.1 ± 7.4(6686)20.7 ± 4.8(990)21.0 ± 4.7(11085)
aHeight [cm, mean ± SD (n)]166.2 ± 6.7(789)179.0 ± 7.2(5444)165.4 ± 6.2(845)178.8 ± 7.0(9129)
aWeight [kg, mean ± SD (n)]63.1 ± 8.1(810)78.5 ± 10.8(5549)63.3 ± 8.5(864)78.1 ± 11.3(9371)
aBody mass index [kg/m2, mean ± SD (n)]22.9 ± 2.4(787)24.5 ± 2.9(5407)23.1 ± 2.6(840)24.4 ± 3.1(9099)
aInitial Push-ups [repetitions, mean ± SD (n)]8.3 ± 2.3(535)15.0 ± 1.0(3906)8.6 ± 2.7(596)15.0 ± 0.9(6413)
aInitial Push-ups Failure [No., (%, n)]52 (9.7%, 535)63 (0.9%, 3906)50 (8.4%, 596)82 (1.3%, 6413)
aInitial Sit-ups [repetitions, mean ± SD (n)]44.8 ± 3.2(542)45.0 ± 1.6(3907)45.4 ± 6.0(607)45.2 ± 2.7(6412)
aInitial Sit-ups failure [No., (%, n)]14 (2.6%, 542)21 (0.5%, 3907)15 (2.5%, 607)33 (0.5%, 6412)
aInitial Shuttle run [level, mean ± SD (n)]7.3 ± 0.7(542)7.5 ± 0.3(3911)7.3 ± 0.9(608)7.5 ± 0.2(6414)
aInitial Shuttle run failure [No., (%, n)]100 (18.5%, 542)80 (2.0%, 3911)105 (17.3%, 608)83 (1.3%, 6414)
Final Push-ups [repetitions, mean ± SD (n)]25.2 ± 9.9(431)43.2 ± 12.2(3302)27.0 ± 8.1(513)46.5 ± 11.8(5942)
Final Sit-ups [repetitions, mean ± SD (n)]91.6 ± 17.2(439)94.9 ± 12.4(3322)96.6 ± 9.5(515)97.6 ± 7.7(5953)
Final 2.4-km run [min, mean ± SD (n)]11.7 ± 0.9(395)10.3 ± 0.9(3111)11.5 ± 0.7(495)9.9 ± 0.8(5794)
bAny injury (%)31.0% (311/1002)15.5% (1040/6690)55.7% (551/990)32.4% (3587/11,087)
bOveruse injury (%)18.1% (181/1002)8.2% (550/6690)45.9% (454/990)21.1% (2337/11,087)
bStress fracture (%)0% (0/1002)0.0% (1/6690)1.3% (13/990)0.3% (31/11,087)
bNeuromuscular injury (%)28.9% (290/1002)13.2% (880/6690)49.9% (494/990)28.4% (3152/11,087)
bTraumatic injury (%)10.9% (109/1002)6.1% (409/6690)25.6% (256/990)14.4% (1598/11,087)
bAttrition (%)7.9% (27/341)4.4% (51/1148)4.5% (27/599)5.0% (198/3945)
bFinal RFA battery failure (%)28.0% (112/400)30.2% (953/3152)8.9% (44/497)12.4% (716/5797)
  1. The results are presented as the mean ± SD for continuous-scale variables and as a number (% of total) for dichotomous outcomes (injuries, attrition, and failure on the final test battery). The percentage of total values for attrition and failure on the final test battery may be underestimated due to missing values. aPotential predictor variables. bOutcome variables for the predictive models. RFA. Recruit Fitness Assessment