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Table 3 Time to first ICD-9 Musculoskeletal Code at Encounter with ICPC Reference Standard Code (n = 1305 patients)

From: Identifying musculoskeletal conditions in electronic medical records: a prevalence and validation study using the Deliver Primary Healthcare Information (DELPHI) database

  # Patients % Patients Cumulative % Mean Monthsa Standard Deviation
Total number of patients with an ICPC Reference Standard Coded Encounter 1305 100.0    
Number of Visits to ICD-9 Code 1st Visit 720 55.2 55.2 n/a  
2nd 159 12.2 67.4 8.3 8.9
3rd 70 5.4 72.7 13.0 10.8
4th 24 1.8 74.6 12.5 9.1
5th+ 25 1.9 76.5 19.5 8.8
Remainder of patients without an ICD-9 Musculoskeletal Code 307 23.5   n/a  
  1. aMean number of months between first ICPC Musculoskeletal coded encounter and first ICD-9 Musculoskeletal coded encounter