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Table 3 Secondary analysis—model specifications—full cohort samples years 8 and 9 cohorts (as at September 2020)

From: Whole School SEND (WSS) Review: study protocol for a two-arm pragmatic parallel cluster randomised controlled trial in 160 English secondary schools

Dependent variable Model Intervention group indicator Strata indicator Covariates Cohort (at 09/20)
Attainment outcomes
GCSE English language Mark (standardised) Linear hierarchical Yes Yes • KS2 Reading raw score at pupil and school levels
• Month of birth
• Sex
• FSM
Year 9
GCSE English language Mark (standardised) Linear hierarchical Yes Yes • KS2 Reading raw score at pupil and school levels
• Month of birth
• Sex
• FSM
Year 8
GCSE Mathematics Mark (standardised) Linear hierarchical Yes Yes • KS2 mathematics raw score at pupil and school levels
• Month of birth
• Sex
• FSM
Year 9
GCSE Mathematics Mark (standardised) Linear hierarchical Yes Yes • KS2 mathematics raw score at pupil and school levels
• Month of birth
• Sex
• FSM
Year 8
Wellbeing outcomes
Total difficulties (SDQ) Linear hierarchical Yes Yes • Total difficulties baseline score
• Month of birth
• Sex
• FSM
Year 9
Total difficulties (SDQ) Linear hierarchical Yes Yes • Total difficulties baseline score
• Month of birth
• Sex
• FSM
Year 8