Table 1

Baseline characteristics of the study population




TotalIntervention groupControl group
(n=4050)(n=2023)(n=2027)
Demographics
Sex (male)2570 (63.5)1299 (64.2)1271 (62.7)
Age (years)42.3 (12.1)42.8 (12.4)41.7 (11.9)*
BMI (kg/m2)23.3 (2.6)23.4 (2.6)23.2 (2.6)*
Training characteristics
Running experience (years)10.3 (10.1)10.4 (10.2)10.1 (10.0)
Weekly training frequency2.6 (1.3)2.6 (1.3)2.6 (1.3)
Weekly training hours3.1 (2.8)3.1 (2.6)3.1 (3.0)
Weekly training distance (km)26.5 (22.7)26.8 (21.4)26.2 (23.8)
Running speed (min/km)5.8 (0.9)5.8 (0.8)5.8 (0.9)
Type of training (%)
 Endurance training70.6 (21.4)70.5 (21.4)70.7 (21.4)
 Interval training22.5 (17.7)22.6 (17.9)22.4 (17.6)
 Specific exercises6.9 (9.9)6.9 (9.8)7.0 (10.1)
Membership of a running club (yes)1210 (29.9)612 (30.3)598 (29.5)
Use of training schedule (yes)2636 (65.1)1307 (64.6)1329 (65.6)
Participation in another sport than running (yes)3276 (80.9)1634 (80.8)1642 (81.0)
Running events
Distance registered for
 10/10.55 km894 (22.1)455 (22.5)439 (21.7)
 15/16.1 km534 (13.2)268 (13.2)266 (13.1)
 Half marathon579 (14.3)291 (14.4)288 (14.2)
 Marathon2043 (50.4)1009 (49.9)1034 (51.0)
Participation in a previous running event (yes)3791 (93.6)1901 (94.0)1890 (93.2)
Average participations per year8.1 (8.7)8.3 (8.8)8.0 (8.6)
RRI
Previous RRI in the last 12 months (yes)2000 (49.4)979 (48.4)1021 (50.4)
Reported RRI at baseline (yes)763 (18.8)351 (17.4)412 (20.3)*
  • Categorical data are presented as n (%) and continuous data () as means (SD).

  • *Statistically significant difference between intervention and control group (p<0.05).

  • BMI, body mass index; km, kilometre; RRI, running-related injury.