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Table 3 Internal consistency (Cronbach's alpha) and part-whole corrected item-total Pearson's correlation coefficient (minimum and maximum of the 5 items) in brackets for the GIPD-Total Score (OC) over time

From: Global impression of perceived difficulties in children and adolescents with attention-deficit/hyperactivity disorder: Reliability and validity of a new instrument assessing perceived difficulties from a patient, parent and physician perspective over the day

Week Patient Parent Physician
0 0.76 (0.46 – 0.67) 0.84 (0.57 – 0.80) 0.86 (0.57 – 0.86)
1 0.83 (0.55 – 0.72) 0.87 (0.62 – 0.86) 0.90 (0.69 – 0.89)
2 0.82 (0.52 – 0.72) 0.90 (0.68 – 0.88) 0.91 (0.67 – 0.92)
4 0.83 (0.53 – 0.74) 0.89 (0.67 – 0.88) 0.90 (0.67 – 0.90)
6 0.85 (0.56 – 0.78) 0.90 (0.67 – 0.89) 0.91 (0.69 – 0.91)
8 0.83 (0.50 – 0.78) 0.88 (0.64 – 0.85) 0.90 (0.65 – 0.91)
12 0.82 (0.52 – 0.71) 0.91 (0.70 – 0.89) 0.93 (0.75 – 0.93)
16 0.82 (0.52 – 0.78) 0.90 (0.69 – 0.88) 0.92 (0.72 – 0.91)
24 0.83 (0.57 – 0.76) 0.89 (0.66 – 0.87) 0.91 (0.66 – 0.92)
  1. GIPD = Global Impression of Perceived Difficulties; OC = observed cases.