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Table 2 DID-EQ: Descriptive Statistics and Exploratory Factor Analysis

From: Psychometric evaluation of the Diabetes Injection Device Experience Questionnaire (DID-EQ) and Diabetes Injection Device Preference Questionnaire (DID-PQ)

Item N Mean SD Range Floor (%)a Ceiling (%)a EFA Factor Loadingsb
1. How difficult is it to prepare the injection device and medication for use? 142 3.7 0.6 1.0–4.0 1 (0.7%) 101 (71.1%) 0.5418
2. How difficult is it to fit the injection into your routine? 142 3.6 0.6 2.0–4.0 0 (0.0%) 95 (66.9%) 0.6105
3. How difficult is it to bring the injection device with you when it is necessary to inject away from home? 140 3.3 0.7 2.0–4.0 0 (0.0%) 67 (47.9%) 0.4858
4. How confident are you that the injection device provides the correct dose of medication every time? 142 3.3 0.8 1.0–4.0 2 (1.4%) 70 (49.3%) 0.6548
5. How confident are you that you are using the injection device correctly? 141 3.4 0.7 2.0–4.0 0 (0.0%) 78 (55.3%) 0.6654
6. How satisfied are you with the size of the needle? 142 3.5 0.8 1.0–4.0 4 (2.8%) 90 (63.4%) 0.6612
7. How satisfied are you with the time it takes to prepare and inject each dose of medication? 141 3.6 0.7 1.0–4.0 2 (1.4%) 103 (73.0%) 0.5769
Device Characteristics Subscale 142 83.0 15.8 38.1–100.0 0 (0.0%) 33 (23.2%)
8. Overall, I am satisfied with the injection device. 142 3.5 0.6 1.0–4.0 1 (0.7%) 81 (57.0%)
9. Overall, it is easy to use the injection device. 142 3.5 0.6 2.0–4.0 0 (0.0%) 84 (59.2%)
10. Overall, it is convenient to use the injection device. 142 3.5 0.6 2.0–4.0 0 (0.0%) 80 (56.3%)
  1. a These percentages indicate the percent of patients at the floor and ceiling of the possible range of each item
  2. b Exploratory factor analysis (EFA) of the seven items included in the Device Characteristics subscale of the final DID-EQ (1-factor solution with oblique rotation)