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Table 4 Scores computed using standard rules and/or after imputation of the missing values

From: Non response, incomplete and inconsistent responses to self-administered health-related quality of life measures in the general population: patterns, determinants and impact on the validity of estimates — a population-based study in France using the MOS SF-36

   Non responders Partial responders All
  Complete and consistent Absent at the 2-month visit Incapable of responding Not willing to fill-in > 2 missing physical and role items > 2 missing mental items (a) > 2 missing physical and role items and > 2 missing mental items Complete questionnaires with > 2 inconsistancies Other (slightly) incomplete and inconsistent questionnaire    
  Mean score Bias 1 Bias 1 Bias 1 Bias 2 Bias 2 Bias 2 Bias 2 Bias 2 Mean (SD) score (using standard scoring rules) Mean (SD) score (after imputation) Bias 2
A             
<60 yrs. 92.01 -2.78 -11.93 -3.92 3.75 0.00 6.62 -8.86 -0.91 91.06 (15.96) 90.18 (16.86) -0.88
60 - 64 yrs 82.28 -6.08 -12.97 -8.59 2.89 0.00 3.40 -11.97 -0.83 80.90 (21.97) 79.01 (21.27) -1.88
65 - 69 yrs. 77.03 -7.58 -13.78 -8.26 -1.91 0.00 5.57 -24.46 -1.06 75.63 (23.11) 73.10 (22.00) -2.52
70 - 74 yrs. 69.69 -3.42 -12.59 -5.09 0.48 0.00 7.56 -7.20 -1.36 68.26 (26.25) 66.93 (23.64) -1.33
75 - 79 yrs 64.21 -3.26 -10.14 -5.73 0.79 0.00 5.93 9.72 -0.60 61.66 (27.73) 60.78 (24.19) -0.88
80 - 84 yrs 52.74 1.10 -4.48 0.12 -0.54 0.00 7.49 3.32 -0.66 51.18 (29.74) 52.11 (24.97) 0.93
≥85 yrs. 37.91 9.03 -0.65 7.91 -9.15 0.00 7.13 0.00 0.68 40.74 (31.87) 43.65 (25.69) 2.91
B             
<60 yrs. 67.60 3.70 -8.30 1.59 0.00 -0.26 0.15 0.00 0.00 67.64 (19.99) 68.26 (20.01) 0.62
60 - 64 yrs 61.32 2.65 -8.03 -2.17 0.00 0.34 -1.29 0.00 -0.01 60.68 (20.90) 60.81 (20.97) 0.13
65 - 69 yrs. 56.79 2.03 -9.06 0.34 0.00 -0.67 -1.01 0.00 0.01 56.60 (21.54) 56.82 (21.39) 0.23
70 - 74 yrs. 54.37 3.19 -8.21 0.23 0.00 0.00 -0.59 0.00 -0.17 53.49 (22.08) 54.10 (21.84) 0.61
75 - 79 yrs 52.35 3.18 -7.97 -0.88 0.00 -0.77 0.34 0.00 -0.1 51.73 (22.01) 52.14 (21.69) 0.41
80 - 84 yrs 48.07 3.45 -2.76 -0.04 0.00 0.00 -0.34 0.00 -0.13 46.62 (23.56) 47.71 (22.78) 1.09
≥85 yrs. 44.94 4.25 -7.78 1.71 0.00 0.00 -1.17 0.00 -0.39 47.94 (24.20) 47.28 (22.84) -0.67
  1. Panel A: Physical functioning, Panel B: General Health.
  2. Bias 1: mean score after imputation – mean score of the complete-consistent group.
  3. Bias 2: mean score after imputation – mean score obtained using standard scoring rules.
  4. (a) Subjects with incomplete questionnaires only for mental dimensions by definition had no missing values for any of PF items.
  5. (b) Subjects with incomplete questionnaires only for physical and role dimensions by definition had no missing values for any of GH items; Subjects with inconsistent questionnaire had no inconsistencies recorded for the GH dimension (see Table 3 for the list of inconsistencies).