Table 2. Content validity for questions.
| Items/domains | Essential | Useful but not essential | Not necessary | CVR | CVR’ | Kappa | Interpretation |
|---|---|---|---|---|---|---|---|
| Factor 1 | 16 | 2 | 0 | 0.77 | 0.88 | 0.69 | Substantial |
| Q1 | 18 | 0 | 0 | 1.00 | 1.00 | 1.00 | Almost perfect |
| Q2 | 15 | 3 | 0 | 0.66 | 0.83 | 0.56 | Moderate |
| Q3 | 18 | 0 | 0 | 1.00 | 1.00 | 1.00 | Almost perfect |
| Q4 | 15 | 3 | 0 | 0.66 | 0.83 | 0.56 | Moderate |
| Factor 2 | 17 | 1 | 0 | 0.88 | 0.94 | 0.83 | Almost perfect |
| Q5 | 18 | 0 | 0 | 1.00 | 1.00 | 1.00 | Almost perfect |
| Factor 3 | 15 | 3 | 0 | 0.66 | 0.83 | 0.56 | Substantial |
| Q6 | 16 | 2 | 0 | 0.77 | 0.88 | 0.69 | Substantial |
| Factor 4 | 17 | 1 | 0 | 0.88 | 0.94 | 0.83 | Almost perfect |
| Q7 | 15 | 3 | 0 | 0.66 | 0.83 | 0.56 | Moderate |
| Total (Ítems) | 115 | 11 | 0 | 5.77 | 6.38 | 0.77 95% CI (0.60-0.93) | Substantial |
| Global CVI | 0.82 | 0.91 | |||||
| Total (domains) | 57 | 15 | 0 | 2.77 | 3.38 | 0.73 95% CI (0.60- 0.86) | Substantial |
| CVI global | 0.69 | 0.84 |
Interpretation criteria for Kappa, using guidelines described by Landis and Koch. Poor= 0.00, slight= 0.01 – 0.20, fair= 0.21 – 0.40, moderate= 0.41 – 0.60, substantial= 0.61 – 0.80 and almost perfect= 0.81 – 1.00. CVR: content validity index. CVR’= content validity ratio. CVI: item-level content validity.