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Table 3 Concordance in Reporting the Occurrence and Timing of Important Disease-Related Events from Patient Responses and Medical Chart Data, Shanghai, China, 2002-2006.

From: Concordance of self-reported and medical chart information on cancer diagnosis and treatment

Name of event a % reported in PQb % reported in MCc Number of shared observations d Agreement (%) Kappa Sensitivity % (95% CI) Specificity % (95% CI)
Date of diagnosis of breast cancer 100.0 99.4 4,916 93.5 0.930 - -
Date of surgery 100.0 99.4 4,916 86.4 0.840 - -
Did you receive chemotherapy? (Yes/No) 100.0 (91.4% Yes) 100.0 (84.1% Yes) 4,948 90.1 0.550 98.3 (97.9-98.7) 45.2 (41.7-48.7)
Date started chemotherapy 91.2 83.6 4,068 79.0 0.790 - -
Did you receive radiation therapy? (Yes/No) 100.0 (32.1% Yes) 100.0 (4.9% Yes) 4,948 71.7 0.170 88.9 (84.3-92.6) 70.9 (69.6-72.2)
Date radiation therapy started 32.1 4.93 217 79.3 0.790 - -
  1. a For the purposes of comparison, all dates were either reported or recoded in YYYYMM format in both instruments.
  2. b PQ: Patient questionnaire.
  3. c MC: Medical chart.
  4. d Number of patients across both surveys that had data for a specific question.