Table 1.

Consistency of reported average waking hours patched per day by method of data collection.

	N	Waking hours patched per day
		Median (IQR)	Cronbach’s alpha (95% CI)
Interviews conducted in 1st year post surgerya	93	4.09 (2.80,5.44)	0.69 (0.58,0.8)
Interviews conducted in 2nd year post surgeryb	86	3.41 (1.43,5.00)	0.85 (0.79,0.90)
Interviews conducted in 3rd year post surgeryc	71	3.51 (1.96,5.46)	0.88 (0.82,0.92)
Interviews conducted in 4th year post surgeryd	62	3.41 (1.73,5.52)	0.87 (0.82,0.92)
All Diariese	43	3.79 (1.73,5.00)	0.86 (0.78,0.92)

^aInterviews conducted 3, 6, 9 and 12 months after surgery.

^bInterviews conducted 15, 18, 21 and 21 months after surgery.

^cInterviews conducted 24, 27, 30, and 33 months after surgery.

^dInterviews 36, 39, 42 and 45 months after surgery.

^eDiaries 2 months after surgery and at 14, 26, 38 and 50 months of age.