Table 2.

Factor analysis: item factor loadings for a single‐scale structure using combined cohort and pilot RCT data

		Self‐assessment (n = 362)	Observer assessment (n = 501)
Eigenvalue		5·26	5·08
Item
1	Was there redness spreading away from the wound? (erythema/cellulitis)	0·45	0·66
2	Was the area around the wound warmer than the surrounding skin?	0·32	0·56
3	Was any part of the wound leaking fluid?	0·87	0·85
3a	Was it clear fluid? (serous exudate)	0·57	0·45
3b	Was it blood‐stained fluid? (haemoserous exudate)	0·72	0·58
3c	Was it thick and yellow/green fluid (pus/purulent exudate)	0·57	0·64
4	Have the edges of any part of the wound separated/gaped open of their own accord? (spontaneous dehiscence)	0·66	0·63
4a	Did the deeper tissue separate?	0·59	0·43
5	Has the area around the wound become swollen?	0·32	0·36
6	Has the wound been smelly?	0·49	0·43
7	Has the wound been painful to touch?	0·36	0·37
8	Have you had, or felt like you have had, a raised temperature or fever? (fever > 38 °C)	0·39	0·39
9	Have you sought advice because of a problem with your wound, other than at a routine planned follow‐up appointment?	0·61	0·59
10	Has anything been put on the skin to cover the wound? (dressing)	0·42	0·54
11	Have you been back into hospital for treatment of a problem with your wound?	0·45	0·35
12	Have you been given antibiotics for a problem with your wound?	0·65	0·67
13	Have the edges of your wound been deliberately separated by a doctor or nurse?	0·41	0·40
14	Has your wound been scraped or cut to remove any unwanted tissue? (debridement of wound)	0·34	0·03
15	Has your wound been drained? (drainage of pus/abscess)	0·38	0·33
16*	Have you had an operation under general anaesthetic for treatment of a problem with your wound?	–	–

^*This item was dropped from the model because of collinearity.