The 2BFit study: is an unsupervised proprioceptive balance board training programme, given in addition to usual care, effective in preventing ankle sprain recurrences? Design of a Randomized Controlled Trial

Table 1 Strata used for subject randomization.

Strata	Options
Gender	Male
	Female
Way of enrolment	ER (11 strata)
	General practice
	Physical therapy office
	Worldwide web
Health care utilisation	No treatment
	Paramedical treatment
	Intramural medical treatment
	Extramural medical treatment

ISSN: 1471-2474