Table 1.

Baseline characteristics and criteria for inclusion in randomised controlled trials of percutaneous transluminal coronary angioplasty (PCTA) compared with medical treatment in non-acute coronary heart disease

Study	Inclusion criteria		No of vessels (% successful dilatation)	Complications related to PTCA in intervention groups	Follow up (months)	Pre-existing condition (%)		Mean ejection fraction (%)	Trial quality score*
	Clinical	Angiographic				MI	Non-Q MI
Parisi 199217	Stable angina, history of angina, MI within 3 months, exercise test with ST depression >3 mm, no previous PTCA	Single or serial stenosis within same artery 70% to 99% proximal two thirds	1 (82)	CABG (2.0%); MI (1.0%); non-Q wave MI (3.0%)	6	0	28.8	65	4
Sievers 199316	Previous non-Q wave MI, no angina in daily life, no previous Q wave MI	Mean (SD) degree of stenosis: 86% (11)	1 (100)	None	24	0	54.5	NA	2
MASS 199518	Stable angina, no Q wave MI, no left ventricular dysfunction	Stenosis ⩾80% before first diagonal branch, length <12 mm, no total occluded lesion	1 (96)	CABG (2.8%); MI (2.8%)	30	0	0	76	3
Folland 199713	Stable angina, history of angina, MI within 3 months, exercise test with ST depression >3 mm, no previous PTCA	Stenosis ⩾70% proximal two thirds, no main artery stenosis >50%, no 3 vessel disease	2 (69)	CABG (2%); MI (0.01%); non-Q wave MI (3.0%)	57	59	NA	66	2
RITA-2 199714	Angina leading to admission within 90 days, previous Q wave MI, no previous PTCA, no left main stem disease	Stenosis ⩾50% stenosis in two projections or 70% stenosis in one projection or occluded arteries	1-3 (93)	CABG (1.4%); MI (1.4%); death (0.2%)	32	47	NA	Normal function in 54% of patients	4
AVERT 199915	Angina or asymptomatic, MI or unstable angina but not within 14 days, no triple vessel disease	Stenosis ⩾50% in one or two vessels, no main artery stenosis	2 (99)	MI (0.5%)	18	43†		61	4

^*See methods section for details of scoring. 

^†Figure for MI and non-Q wave MI. 

MI: myocardial infarction, CABG: coronary artery bypass graft; NA: not available.