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Table 1 Strata used for subject randomization.

From: 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

Strata Options
Gender Male
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