Table 4.

Internal consistency reliability

	PEmb-QoL questions	Number of items	Cronbach’s alpha	Average inter-item correlation (r)
Frequency of complaints	Q1	8	0.90	0.52
Activities of daily living limitations	Q4	13	0.95	0.60
Work-related problems	Q5	4	0.91	0.72
Social limitations	Q6	1	-	-
Intensity of complaints	Q7, Q8	2	0.70	0.54
Emotional complaints	Q9	10	0.92	0.52
PEmb-QoL summary score	Q1, Q4, Q5, Q6, Q7, Q8, Q9	38	0.92	0.44