Development and validation of a disease-specific quality of life questionnaire for patients with peripheral artery disease (QOLPAD)

Journal of Patient-Reported Outcomes

Table 2 Characteristics of the study population (validation study)

	All patients at baseline
		n = 103	%
Stage of PAD, n (%)	I	1	1.0
	IIa	9	8.7
	IIb	60	58.3
	III	12	11.7
	IV	18	17.5
	Missing	3	2.9
Sex, n (%)	Male	70	68.0
	Female	33	32.0
Age (years)	Mean ± SD	68.6 ± 10.2
Treatment	Bypass surgery	12	11.7
	Bypass recanalization	2	1.9
	Bypass and thromboendarterectomy	1	1.0
	Thromboendarterectomy	35	34.0
	Amputation	1	1.0
	Percutaneous transluminal angioplasty	39	37.9
	Urokinase and Percutaneous transluminal angioplasty	1	1.0
	Sympathectomy	1	1.0
	Structured vascular exercise	4	3.9
	Prostaglandin E1	2	1.9
	Missing	5	4.9

Baseline: first measurement; n: number of patients; PAD: peripheral artery disease; SD: standard deviation. PAD stage was classified according to Fontaine, with 1–5 denoting stage I–IV, respectively [3]