Table 4.
The psychometric properties of the RDQ-13 scale.
| Domain | Cronbach alpha for overall instrument | Corrected item-total correlation | Cronbach alpha if the item deleted | Test (n = 65) | Retest (n = 63) | Intraclass correlation coefficient* |
|---|---|---|---|---|---|---|
| Median | Median | |||||
| Domain 1 | 0.700 | 0.513 | 0.654 | 3.00 | 4.00 | 0.791* |
| Domain 2 | 0.411 | 0.689 | 4.00 | 4.00 | 0.847* | |
| Domain 3 | 0.351 | 0.680 | 4.00 | 4.00 | 0.896* | |
| Domain 4 | 0.305 | 0.690 | 4.00 | 4.00 | 0.821* | |
| Domain 5 | 0.373 | 0.677 | 4.00 | 4.00 | 0.933* | |
| Domain 6 | 0.342 | 0.692 | 4.00 | 4.00 | 0.893* | |
| Attitude score | 0.334 | 0.692 | 11.00 | 11.00 | 0.985* | |
| Perception score | 0.297 | 0.694 | 9.00 | 9.00 | 0.802* |
Cronbach alpha was calculated for overall scale including knowledge (domains 1–6), attitude and perception questions.
*
Statistically significant at P < .05; Domain 1 to 6 are related to knowledge score. Domain 1: Related to renal dose adjustment; Domain 2: Factors to be considered when determining the appropriate dose for a patient with renal impairment; Domain 3: Medications commonly require renal dose adjustment; Domain 4: Calculating the appropriate dose for a patient with renal impairment; Domain 5: Consequences of not adjusting the dose of medications for patients with renal impairment; Domain 6: Resources to determine the appropriate dose for a patient with renal impairment.