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Table 1 Illustrative case study randomising ten emergency departments (clusters) with three cluster-level binary covariates

From: Mind the gap: covariate constrained randomisation can protect against substantial power loss in parallel cluster randomised trials

  Emergency department (cluster)
Characteristic 1 2 3 4 5 6 7 8 9 10
Large patient volume Yes No Yes Yes No Yes No No No No
Dedicated mental health team Yes No Yes Yes Yes No No No No Yes
Access to urgent mental health follow-up Yes No No No Yes Yes Yes No No No
  Strata  
  1 2 3 4 5 6 7 8
Large patient volume Yes Yes Yes Yes No No No No
Dedicated mental health team Yes Yes No No Yes Yes No No
Access to urgent mental health follow-up Yes No Yes No Yes No Yes No
Number of clusters 1 2 1 0 1 1 1 3