Table 10

Distribution type and analyses of the difference between F/NF regarding prerace performance indices
Values Mean (SD) Test on normal distribution Shapiro-Wilk [29] Test on difference F/NF
Valid Missing
n n (%) F NF statistic P test typea P b
PRY (years) 21 1 4.5 16.5 18.7 0.936 0.185c ITT 0.530
nF M (n) 19 3 13.6 81.5 194.3 0.481 0.000 MWU 0.211
nF UM (n) 22 0 0 94.8 86.0 0.858 0.005 MWU 0.895
nF MSUM (n) 22 0 0 7.0 5.4 0.936 0.165c ITT 0.146
PRTVol08 (km/week) 21 1 4.5 117.9 (34.3) 88.0 (20.8) 0.959 0.505c ITT 0.032d
PRTTime08 (hour/week) 21 1 4.5 13.0 11.9 0.971 0.761c ITT 0.427
PRTInt08 (km/hour) 22 0 0 9.0 (1.47) 7.5 (0.93) 0.909 0.044 MWU 0.040d
PRTVol09 (km/week) 21 1 4.5 126.1 (35.2) 89.7 (17.4) 0.956 0.435c ITT 0.010d
PRTTime09 (hours/week) 21 1 4.5 14.2 12.0 0.947 0.303c ITT 0.159
PRRM (hours) 15 7 31.8 3.1 3.1 0.851 0.018 MWU 0.676
PRR50km (hours) 9 13 59.1 4.3 (0.57) 5.1 (0.26) 0.914 0.343c ITT 0.026d
PRR100km (hours) 17 5 22.7 9.5 10.4 0.933 0.248c ITT 0.241
PRR6hr (km) 13 9 40.9 67.9 59.7 0.918 0.238c ITT 0.218
PRR12hr (km) 10 12 54.5 99.9 87.3 0.940 0.548c ITT 0.558
PRR24hr (km) 16 6 27.3 199.8 (22.5) 168.5 (26.0) 0.961 0.672c ITT 0.036d

aITT: independent t-test; bbilateral (asymptotic) test; csignificance not shown (P >0.05): normal distribution accepted; dmean differences between finishers and non-finishers are significant. F, finishers; M, marathon; MSUM, multistage ultramarathon; MWU: Mann–Whitney-U test; n, number; NF, non-finishers; PRR, prerace records; PRT, prerace training; PRY, years of regular endurance running; IM, ultramarathon.

Bold numbers mark significant P-values of the test on difference between F and NF.

Schütz et al.

Schütz et al. BMC Medicine 2013 11:122   doi:10.1186/1741-7015-11-122

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