Table 4.
Risk factors associated with the incidence of musculoskeletal injuries.
Risk factor
Injured
Uninjured
RR
95% CI
p
Internal risk factors
Age
21.9 2 3.3
22.0 2 4.3
–
–
0.92
Height (cm)
178.1 1 8.0
173.5 1 9.0
–
–
0.01
Weight (kg)
71.8 7 9.5
67.9 6 10.5
–
–
0.06
Tennis experience
15 (8–23)
15 (6–31)
–
–
0.79
ITF singles ranking
> 742*
11 (11.5)
85 (88.5)
1.3
1.1 – 1.5
0.004
< 742
20 (30.8)
45 (69.2)
Gender
Female
11 (15.5)
60 (84.5)
1.4
0.7 – 2.8
0.280
Male
20 (22.2)
70 (77.8)
Previous injury
Absent
4 (3.6)
107 (96.4)
2.1
1.5 – 2.8
<0.001
Present
27 (54.0)
23 (46.0)
External risk factor
WBGT zone
Zone 4
8 (10.8)
66 (89.2)
1.2
1.0 – 1.4
0.02
Zone 5
23 (26.4)
64 (73.6)
Inciting event
Round of match
Qualifying
6 (11.5)
46 (88.5)
1.2
1.0 – 1.3
0.09
Main round
25 (22.9)
84 (77.1)
Match load
Singles
7 (11.9)
52 (88.1)
1.2
1.0 – 1.3
0.09
Singles + doubles
24 (23.5)
78 (76.5)
RR: relative risk; CI: confidence interval; * includes 31 athletes with no ITF rank.