Implementation of blinded outcome assessment in the Effective Verruca Treatments trial (EverT) – lessons learned

Table 1 Number of uninterpretable photographs by centre and type of healthcare professional

Centre ID number	Type of healthcare professional	Number of photographs	Number of uninterpretable photographs^a	Take digital photos as part of their routine work
1	Podiatrist^b	48	0	Yes
2	GP	1	0	No
3	Practice nurse	4	2	No
4	Podiatrist	9	1	Yes
5	Podiatrist^b	33	4	Yes
6	GP	12	0	No
7	Podiatrist	11	0	Yes
8	Practice nurse	5	1	No
9	Podiatrist	8	2	No
10	Podiatrist	33	16	No
11	Practice nurse	13	4	No
12	Practice nurse	3	0	No
13	GP	9	0	No
Total		189	30

^a Photograph uninterpretable due to being unclear (n = 27); insufficient detail (n = 4); lesion obstructed by identifier card (n = 1); other reason (n = 1). More than one category could be checked so the total for all categories totals more than 30
^b HCP used their own camera; all other sites used the camera provided by the trial

ISSN: 1757-1146