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Table 4 Baseline characteristics of the TEFR study population

From: The Transeurope Footrace Project: longitudinal data acquisition in a cluster randomized mobile MRI observational cohort study on 44 endurance runners at a 64-stage 4,486km transcontinental ultramarathon

  all subjects MR group 1 MR group 2
  number (%) number (%) number (%)
total 44 22 (50.0) 22 (50)
men 40 (90.9) 20 (90.9) 20 (90.9)
women 4 (9.1) 2 (9.1) 2 (9.1)
Finisher (F) 30 (68.2) 19 (86.4) 11 (50.0)
Non-finisher (NF) 14 (31.8) 3 (13.6) 11 (50.0)
  mean/median (SD) mean/median (SD) mean/median (SD)
age (years) 49.7 (10.5) 50.3 (9.6) 49.1 (11.5)
prerace history:    
years of regular endurance running 17.9 (7.5) 19.1 (7.5) 17.1 (7.4)
finished marathons 91.7 (168.6) 62.0 (93.4) 121.47 (218.8)
finished ultra-marathons 85.4 (63.6) 81.1 (59.0) 89.8 (69.0)
finished multistage ultra-marathons 5.7 (3.6) 5.1 (4.1) 6.3 (2.9)
anthropometry:    
height (cm) 175 (8) 175 (6) 174 (9)
BMI (kg/m2) 23.1 (2.2) 22.8 (1.8) 23.4 (2.6)
body fat percentage, BIA (%) 11.2 (4.3) 11.0 (4.1) 11.4 (4.5)
body fat percentage, calculateda (%) 16.6 (4.2) 15.5 (3.2) 16.6 (5.0)
body fat percentage, MRI (%) - - 22.7 (6.0)
muscle percentage, calculatedb (%) 49.8 (5.1) 49.7 (4.7) 50.0 (5.7)
somatic lean tissue, MRI (%) - - 65.0 (5.3)
active range of hip motion (°)    
flexion, 121 (26)c 123 (27) 122 (26) 124 (27)
extension, 19 (16)c 24 (17) 25 (17) 21 (16)
abduction, 42 (22)c 43 (23) 43 (22) 42 (24)
internal rotation, 31 (16)c 31 (16) 30 (16) 32 (16)
external rotation, 32 (18)c 34 (19) 33 (18) 34 (19)
active range of knee motion (°):    
flexion, 132 (20)c 134 (19) 135 (20) 133 (19)
lower limb alignment: -   -
LL difference [mm], 6 (95th: 11)d   2 (3.3), 95th: 9)  
FTR, 1.26 (0.05)d   1.17 (0.04)  
FTA [°], m: 178 (174-182)e   178 (175-182)  
w: 181 (177-185)e    
FTA difference   1 (0.8)  
MAD (mm), 10 (4-16)e   10 (4-17)  
  1. acalculated by the updated DC (DEXA criterion)-equation according to Ball et al. [142], inputs: age, 7SF (chest, midaxillary, triceps, subscapular, abdomen, suprailiac, thigh); b calculated estimation of skeletal muscle mass according to Lee et al. [143], inputs: gender, age, race, height, 3 SF and CF (upper arm, thigh, calf); cnormal AROM-values of hip and knee joints (goniometric data) according to the 1st National Health and Nutrition Examination Survey (NHANES I) [144]; dnormal values of side differences in the lower limb [119], generated with computed tomography gold standard method [117]. FTR: femoro-tibial length-ratio. Leg length (LL) differences of > 14 mm (3SD) are seen as pathological [122, 119, 118]; enormal values of femorotibial angle (FTA) and mean axis distance (MAD) [116, 120, 121]