Table 1

Phase 1 follow-up diagnostic assessment sampling strategy, with study numbers

Sampling groupObserved Q-CHAT
(missing items=0)
Maximum Q-CHAT
(missing items=4)
% sampledTotalAssessment numbers
SelectedInvitedAgreed
1≥38≥4410086867440
2≤37≥4450211096
341–4341–435061312816
4≤4041–4350211085
538–4038–4025129312820
6≤3738–402525552
7≤37≤3713300403932
Total3643213191121
  • Q-CHAT, Quantitative Checklist for Autism in Toddlers.