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Table 3 Mean values, internal consistency and test–retest analysis of IQualiV–OG-21

From: Development of a new multimedia instrument to measure cancer-specific quality of life in Portuguese-speaking patients with varying literacy skills

IQualiV-OG-21 domains

Number of items

Mean (SD)

Cronbach’s α (95 % CI)

ICC (95 % CI)a

Emotional

6

41.7 (24.9)

0.85 (0.82–0.87)

0.88 (0.80–0.93)

Physical

5

33.0 (23.8)

0.79 (0.75–0.82)

0.79 (0.66–0.88)

Financial

2

39.6 (32.4)

0.81 (0.77–0.85)

0.83 (0.72–0.90)

Existential

3

15.2 (22.2)

0.81 (0.77–0.84)

0.96 (0.94–0.98)

Functional

3

28.9 (25.9)

0.77 (0.72–0.81)

0.86 (0.77–0.92)

Personal relationships

2

13.4 (20.7)

0.75 (0.69–0.80)

0.94 (0.90–0.97)

Total score

21

28.7 (17.7)

0.90 (0.89–0.92)

0.95 (0.92–0.97)

  1. SD standard deviation, ICC intraclass correlation coefficient
  2. an = 64