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Table 1 Stratification of participating schools

From: Protocol for a cluster randomised controlled trial of an intervention to improve the mental health support and training available to secondary school teachers – the WISE (Wellbeing in Secondary Education) study

   England Wales
   Area 1 Area 2 Area 3 Area 4
FSM eligibility (%)a,b Low 2 schools 2 schools 2 schools 2 schools
  (range: 8.4–17.2) (range: 3.8–15.3)
Medium 2 schools 2 schools 2 schools 2 schools
  (range: 18.5–34.9) (range: 16.1–25.1)
High 2 schools 2 schools 2 schools 2 schools
  (range: 39.2–77.0) (range: 25.8–44.8)
  1. Notes
  2. aCut-offs for each FSM stratum were based on national mean and distribution, and therefore were slightly different for England and Wales (mean = 29.4 % over the past 6 years for England and 17.0 % over the past 3 years for Wales)
  3. bRange given is the range of FSM among eligible schools in each strata