Table 1.

Study design: The 16 interview formats according to baseline risk of heart attack, level of effectiveness, and initial piece of information

		ARR		RRR		NNT		POL
Baseline Risk	Level of effectiveness	Effect size	n	Effect size	n	Effect size	n	Effect size	n
Low (5%)	Low	2%	79	40%	79	50	68	4 mths	69
	High	4%	75	80%	69	25	69	8 mths	67
High (15%)	Low	5%	71	33%	73	20	82	8 mths	86
	High	10%	69	66%	71	10	69	16 mths	73
Total			294		292		288		295