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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