Preventing injuries among recreational adult volleyball players: Results of a prospective randomised controlled trial

Figures & data

Figure 1. Illustrations of VolleyVeilig.

Table 1. Baseline characteristics of the intervention and control groups.

	Intervention group	Control group
Number of teams/players	37/348	36/324
Age (years; mean ± SD) *	30 ± 11	27 ± 10
Sex (male/female; %) *	38/62	24/76
Height (cm; mean ± SD)	175 ± 28	176 ± 22
Weight (kg; mean ± SD)	74 ± 13	73 ± 12
Exposure to volleyball (hours)
Total	28,654	25,479
Training	18,545	15,761
Match	10,109	9,718
Injured in the previous 3 months (%)	42	36

SD, standard deviation; %, percentage; cm, centimetre; kg, kilogram

* difference between the intervention and control groups (p < .05).

Figure 2. Flowchart of participants in the prospective controlled trial.

Table 2. Acute and overuse injuries: comparison between the intervention and control groups.

	Intervention group	Control group	Comparison
	Incidence rate (95%CI)^†		Crude HR (95%CI)	Adjusted HR (95%CI)^‡
Acute injuries
Total	8.9 (7.8–10.0)	11.3 (10.0–12.6)	0.82 (0.69–0.98)	0.85 (0.71–1.02)
Training	5.3 (4.3–6.4)	6.7 (5.5–8.0)	0.86 (0.64–1.14)	0.90 (0.67–1.22)
Match	7.0 (5.4–8.6)	8.1 (6.3–9.9)	0.89 (0.63–1.25)	0.84 (0.58–1.20)
	Mean prevalence (SD)
Overuse injuries	4.8 (2.5)	4.2 (3.1)	p > .05

95%CI, 95% Confidence Interval; HR, hazard ratio; SD, Standard deviation

^†number of injuries per 1,000 h

^‡Adjusted for age and sex