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Table 1 Response rates and reasons for non-participation amongst students within control and intervention schools, at baseline, 4-month and 12-month follow up

From: Free breakfasts in schools: design and conduct of a cluster randomised controlled trial of the Primary School Free Breakfast Initiative in Wales [ISRCTN18336527]

  Intervention Control
  DC1 DC2 DC3 DC1 DC2 DC3
Sampled 2484 2533 2569 2442 2437 2493
Parent refusal 12 0 2 6 0 0
Left school 9 34 60 11 20 41
Eligible 2463 2499 2507 2425 2417 2452
Data collected 2205 2201 2272 2145 2157 2200
Data missing/invalid 18 13 5 14 8 31
Excluded due to special educational needs 37 19 11 23 16 7
Child refusal 3 0 2 3 6 7
Absent 200 266 217 228 230 205
Class unavailable on day of testing 0 0 0 12 0 0