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Table 4 Summary of measurement properties of different versions of the PHPQoL questionnaire

From: Development of a new tool for assessing Health-Related Quality of Life in patients with primary hyperparathyroidism

  PHP-QoL-V.2 (16 items) PHPQoL-9 PHPQoL-7 PHPQoL-V.1 (34 items)
(Physical functioning domain of V.2 of the PHPQoL questionnaire) (Emotional functioning domain of V.2 of the PHPQoL questionnaire) Piloted version of questionnaire
No. of items 16 9 7 34
Score distribution Valid observation 61 66 62 55
Mean 58.73 58.08 59.10 63.2
SD 21.95 25.49 20.82 19.70
25th percentile 43.75 38.89 42.86 50.74
50th percentile 57.81 55.56 60.71 66.18
75th percentile 76.56 77.78 78.57 80.88
Total item correlation   0.45-0.81 0.66-0.84 0.57-0.77 0.03-0.81
Internal consistency (Cronbach’s alpha) 0.92 0.91 0.82 0.96
Rasch analysis     
Person separation 3.06 2.87 2.23 3.72
Person reliability 0.90 0.89 0.83 0.93