Table 4 Internal consistency reliability
PEmb-QoL questions | Number of items | Cronbach’s alpha | Average inter-item correlation (r) | |
|---|---|---|---|---|
Frequency of complaints | Q1 | 8 | 0.90 | 0.52 |
Activities of daily living limitations | Q4 | 13 | 0.95 | 0.60 |
Work-related problems | Q5 | 4 | 0.91 | 0.72 |
Social limitations | Q6 | 1 | - | - |
Intensity of complaints | Q7, Q8 | 2 | 0.70 | 0.54 |
Emotional complaints | Q9 | 10 | 0.92 | 0.52 |
PEmb-QoL summary score | Q1, Q4, Q5, Q6, Q7, Q8, Q9 | 38 | 0.92 | 0.44 |