Skip to main content

Table 3 Characteristics of included participants in the primary analysis

From: The Value of Preseason Screening for Injury Prediction: The Development and Internal Validation of a Multivariable Prognostic Model to Predict Indirect Muscle Injury Risk in Elite Football (Soccer) Players

Characteristic/candidate prognostic factor Measurement method Data type Freq. (%) if categorical Min Lower quartile Median Upper quartile Max Missing values n (%)
Anthropometrics          
 Age at PHE (years) Birthdate Cont. - 16.01 17.80 19.69 23.56 39.59 0 (0)
 Height (cm) Standing height Cont. - 164.3 176.0 180.0 185.5 195.0 18 (5.68)
 Weight (kg) Digital scales Cont. - 56.8 69.2 73.6 80.0 94.0 18 (5.68)
 BMI (kg/m2) Calculated using the formula: kg/m2 Cont. - 18.1 21.8 22.7 23.7 29.1 23 (7.26)
Past medical history          
Freq. of previous IMIs in 3 years prior to PHE Medical records Dis./cont. - 0 0 1 2 7 0 (0)
Most recent previous IMI in 3 years prior to PHE          
 Never Medical records Cat. 143 (45.11) - - - - - 0 (0)
 < 6 months Medical records Cat. 48 (15.14) - - - - - 0 (0)
 6–12 months Medical records Cat. 52 (16.40) - - - - - 0 (0)
 > 12 months Medical records Cat. 74 (23.34) - - - - - 0 (0)
Musculoskeletal examination          
 PROM hip internal rotation difference (deg.) Supine ROM test with digital inclinometer Cont. - − 25.0 − 3.0 0.0 5.0 20.0 20 (6.31)
 PROM hip external rotation difference (deg.) Supine ROM test with digital inclinometer Cont. - − 20.0 − 5.0 0.0 5.0 25.0 20 (6.31)
 Hip flexor length difference (deg.) Thomas test with digital inclinometer Cont. - − 20.0 − 2.0 0.0 3.0 14.0 23 (7.26)
 Hamstring length/neural mobility difference (deg.) SLR with digital inclinometer Cont. - − 20.0 0.0 0.0 0.0 15.0 23 (7.26)
 Calf muscle length difference (deg.) WBL with digital inclinometer Cont. - − 20.0 − 2.0 0.0 3.0 15.0 20 (6.31)
Lower extremity power          
 CMJ power (watts) CMJ using force platform Cont. - 2625.0 3707.0 4150.0 4662.0 6577.0 42 (13.25)
  1. PHE periodic health examination, I-IMI index indirect muscle injury, IMI indirect muscle injury, min minimum, max maximum, n observations, Freq frequency, WBL weight bearing lunge, CMJ countermovement jump, ROM range of movement, PROM passive range of movement, deg. degrees, SLR straight leg raise, BMI body mass index, kg/m2 kilograms/body height (metres) squared, cm centimetres, kg kilograms, Cont. continuous, dis./cont. discrete treated as continuous, cat. categorical