The WS-DFUD-KQ comprises of 12 items. Three of the 12 items are negatively worded and state as misconceptions regarding warning signs of diabetic foot ulcer deterioration (i.e. item 8, 9, 10). The response choices include "yes," "no," and "uncertain." Each item with the correct answer obtains a score of 1, after which the scores are summed to obtain a total score. The higher scores represent better knowledge. The total WS-DFUD-KQ score ranges 0-12.

The content validity index of each of the 12 items was above 0.8. The item difficulty of the 12 items of the WS-DFUD-KQ ranged from 0.54 to 0.87, and the item discrimination index D values ranged from 0.42 to 0.83. The KR-20 of the WS-DFUD-KQ was 0.82. The Spearman's rho coefficient for test-retest reliability over a two-week period was 0.75.

The Diabetes Foot Self-Care Behavior Scale (DFSBS) contains 7 items. The scale has two parts: In the first part, the responses are rated on the number of days patients performed a certain behavior over the course of one week. In the second part, the responses are rated by the frequency with which patients performed a certain behavior in general, from never (1) to always (5). When the score of the total scale is calculated, the number of days for each foot-care measure in the first part is categorized across 5 groups (0 days, 1-2 days, 3-4 days, 5-6 days, and 7 days). Thus, all items on the scale are rated on a 5-point Likert-type scale with the higher scores represented better foot self-care behaviors. The total DFSBS score ranges 7-35.

The Chinese version of summary of diabetes self-care activity questionnaire (C-SDSCA) is a short self-reported questionnaire of diabetes self-management across five components of diabetes regimen a person with diabetes should practice in order to stay well ( i. e. diet, exercise, blood sugar testing, foot care and attention to smoking). The number of days for each diabetes self-management behavior is measured. The higher scores represented better self-care behaviors of diabetes. The total C-SDSCA score ranges 11-77.

The Diabetes-related Foot Ulcer Self-Management Behavior Scale (DFUSMBS) measures behaviors that patients use to manage their diabetes-related foot ulcers to promote wound healing and to prevent the deterioration of their wounds, including timely treatment seeking and management, wound management, and self-management of diabetes. The 18-item scale includes three reverse-scored items (Item 1, 2, 11) and uses a 5-point Likert scale (1 = never, 2 = seldom, 3 = sometimes, 4 = frequently, and 5 = always). The higher scores represent better diabetes-related foot ulcer self-management behaviors. The total DFUSMBS score ranges 18-90.

The Chinese version of the Diabetes Management Self-Efficacy Scale (C-DMSES) is a self-administered scale containing 20 items. It assesses the extent to which respondents are confident that they could manage their blood sugar, diet, and level of exercise. Responses are rated on a 10-point Likert-style from not at all (1) to certainly can do (10). The responses are summed to become a total score for "self-efficacy". Possible scores range from 0 to 200 points. The tool had acceptable reliability and validity in a Taiwanese population.

Two items will be used to measure the self-efficacy regarding diabetes foot self-care of participants. They are "I have confidence to check my feet (including the bottom of my feet and between the toes) daily, either by myself or to ask for someone's help.", and "I have confidence to apply moisturizing lotion to my feet by myself or asking for someone's help, If my skin is dry". Responses are rated on a 10-point Likert-style scale according the degree of confidence.

The 16-item diabetes-related foot ulcer self-management self-efficacy scale will be used to measure the confidence in delivering diabetic foot ulcer self-management behavior, and management of diabetic foot ulcer. Responses are rated on a 10-point Likert-style from not at all (1) to certainly can do (10). The higher score indicates better self-efficacy.