Table 3.
Items/Scales | External consistency (inter-rater reliability)
|
Internal consistency
|
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---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Average percentage agreement
|
Average Cohen’s Kappa
|
Average Gwet’s AC1
|
Average Cronbach’s α
|
Average Item-Total Correlation
|
|||||||||||
Material type | All (%) | A/V (%) | Print (%) | All | A/V | All | A/V | All | A/V | All | A/V | ||||
Understandability items/scale | 82 | 79 | 84 | 0.57 | 0.49 | 0.58 | 0.74 | 0.71 | 0.76 | 0.70 | 0.77 | 0.81 | 0.55 | 0.56 | 0.54 |
Actionability items/scale | 82 | 83 | 80 | 0.58 | 0.53 | 0.54 | 0.75 | 0.72 | 0.72 | 0.75 | 0.74 | 0.84 | 0.86 | 0.85 | 0.81 |
All items/scales | 82 | 80 | 83 | 0.57 | 0.50 | 0.57 | 0.74 | 0.71 | 0.75 | 0.71 | 0.76 | 0.82 | 0.62 | 0.62 | 0.60 |