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Table 1 Item description and scaling properties of the questionnaires extracted from the validation phase (26 item version) and from the replication phase

From: Construction of a questionnaire measuring outpatients' opinion of quality of hospital consultation departments

  Intermediate questionnaire 26-items retained at the and of the first validation phase (first study, n = 1007) Final questionnaire 27-item questionnaire tested at the replication phase (second study, n = 248)
Title of the scales Consultation with the doctor Appointment making Reception Waiting time & facilities Overall scale Consultation with the doctor Appoint-ment making Reception & facilities Waiting time Overall scale
Items properties           
# of items in the scale 13 6 3 4 26 13 6 5 3 27
# of questionnaires with at least 1/2 of items completed (1) 996 931 1004 1001 1003 235 248 247 244 248
# of items with 'non response' ≥ 20% 0 0 0 0 0 0 0 0 0 0
# of item with 'does not apply' response ≥ 20% 0 2 0 0 2 1 0 0 0 1
# of items with ceiling effect ≥ 50% (≥ 60%) 13 (12) 6 (4) 3 (2) 0 (0) 22 (18) 12 (4) 1 (1) 2 (0) 0 (0) 15 (5)
# of items floor effect ≥ 50% 0 0 0 0   0 0 0 0 0
range of Weighted kappa (# of items with kappa ≥ 0.60) 0.14–0.83 (10) 0.46–0.77 (3) 0.45–0.78 (1) 0.68–0.82 (4) 0.14–0.82 (18) - - - -  
Scaling properties           
Mean score (± sd) 85.1 (17.2) 83.2 (19.9) 88.0 (14.5) 69.6 (24.9) 82.7 (13.7) 84.1 (17.2) 80.6 (18.5) 75.3 (18.3) 61.3 (19.6) 78.9 (15.3)
Ceiling / floor effect (%) 26.2 / 0.10 32.2 / 0.2 38.5 / 0.1 16.2 / 1.1 4.2 / 0.1 25.8 / 0.4 24.7 / 0.4 13.7 / 0.5 19.0 / 4.9 4.4 / 0.4
Skewness value /SE -3.00 -2.09 -3.5 -0.86 -2.67 -0.98 -0.83 -0.58 -0.20 -0.76
Range of interscale correlations 0.33–0.35 0.34–0.37 0.35–0.40 0.33–0.40 - 0.46–0.51 0.51–0.59 0.42–0.49 0.42–0.53 -
# of items with own scale correlation ≥ 0.40 (3) 12 6 2 4 - 13 6 5 3 -
# of items with own scale (3) correlation greater than with other scale 13 6 3 4 - 13 6 4 3 -
Cronbach alpha coefficient 0.85 0.82 0.69 0.77 0.88 0.94 0.87 0.79 0.89 0.94
Intraclass coefficient [IC95%] 0.69 [0.49–0.83] 0.84 [0.71–0.91] 0.86 [0.75–0.92] 0.83 [0.71–0.91] 0.90 [0.81–0.94] - - - -  
  1. (1) Including non response and 'does not apply' response' (2) From the final principal component factor analysis (3) Corrected for overlap