Design and development of the MacTSQ measure of satisfaction with treatment for macular conditions used within the IVAN trial

Journal of Patient-Reported Outcomes

Table 4 Internal consistency reliability for each of the two MacTSQ subscales

Item N	Item	Cronbach’s alpha if item deleted
Item N	Item	Information provision and convenience	Safety, efficacy and discomfort
11	Continue	0.683
10	Information	0.706
15	Encourage others	0.668
14	Length of course	0.713
1	Treatment	0.716
13	Time at clinic	0.734
6	Apprehensive		0.709
3	Discomfort or pain		0.728
9	Safety		0.735
2	Side effects		0.745
5	Unpleasant		0.759
4	Treatment working		0.774
Subscale alpha		0.740	0.776
Eigenvalues		4.477	1.652

Italicized figures represent the pattern and structure coefficients of the 2-factor solution