THE SAAF STUDY: evaluation of the Safeguarding Children Assessment and Analysis Framework (SAAF), compared with management as usual, for improving outcomes for children and young people who have experienced, or are at risk of, maltreatment: study protocol for a randomised controlled trial

Table 1 Scenario planning - power calculations undertaken to inform the sample size

Scenario	Re-abuse Rate % Control	Re-abuse Rate % SAAF	Unclustered total sample size	Design effect	Clustered total sample size (rounded)
1	50	40	800	1.5	1,200
2a	25	15	510	1.5	770
2b	25	15	510	2.0	1,000
3a	10	5	900	1.5	1,300
3b	10	5	900	2.0	1,800
4a	10	2.5	400	1.5	600
4b	10	2.5	400	2.0	800
5a	20	10	400	1.5	600
5b	20	10	400	2.0	800

ISSN: 1745-6215