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Table 2 Number of missing values in FACT-G, FLIC and EORTC QLQ-C30 by presentation order(a)(b)

From: Order effects: a randomised study of three major cancer-specific quality of life instruments

  FACT-G FLIC EORTC QLQ-C30
Number of missing values Order A (N = 455) Order B (N = 401) Order A (N = 389) Order B (N = 448) Order A (N = 433) Order B (N = 428)
0 207 195 303 345 368 380
1 157 139 47 52 46 40
2 48 36 16 27 12 6
3 20 9 15 16 2 0
4 9 8 4 3 3 2
5 5 4 0 4 1 0
6 4 3 1 1 0 0
7 2 2 1 0 0 0
8 3 2 1 0 0 0
≥9 0 3 1 0 1 0
Mean 0.96 0.93 0.44 0.43 0.25 0.14
p-value (Fisher's exact test) 0.825   0.457   0.308  
  1. (a) Order A and order B mean, respectively, the HRQoL instrument was placed first and second in the questionnaire.
  2. (b) The FACT-G comprises 27 items, the FLIC comprises 22, and the EORTC QLQ-C30 comprises 30 items. Therefore the results are not comparable across questionnaires.