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Table 4 Agreement between the OCC-Q and the databases for the reported quantity of health care used

From: Good agreement between questionnaire and administrative databases for health care use and costs in patients with osteoarthritis

  OCC-Q
Mean ± SD
Databases
Mean ± SD
ρ c* Mean difference
(95% CI)†
95% limits of
agreement
GP contacts 1.3 ± 1.0 1.4 ± 1.2 0.41 0.06 (-0.3, 0.4) -2.34 to 2.46
Total number of medications 1.8 ± 1.2 1.6 ± 1.2 0.63 -0.22 (-0.50, 0.07) -2.25 to 1.8
  1. *ρ c = Lin's concordance correlation coefficient
  2. †95% CI assumes a normal distribution
  3. Abbreviations: OCC-Q, Osteoarthritis Cost and Consequences Questionnaire; GP, general practitioner; SD, standard deviation; CI, confidence interval