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Table 2 Main results for the 87 identified potential cases of osteonecrosis

From: Can health care databases be used to identify incident cases of osteonecrosis?

Definition using administrative data Number of records meeting definition (percentage) PPV for confirmed ON (prevalent and incident) PPV for incident ON Number of records needing review for every 1,000 with any ON code Number of incident ON cases expected after review
At least 1 ON code 87 (100%) 90% 17% 1,000 170
More than 1 ON code 85 (98%) 92% 18% 980 176
At least 1 inpatient ON code 47 (54%) 100% 23% 540 124
(At least 1 ON code) and (no prior codes for OA) 25 (29%) 76% 24% 290 70
(At least 1 inpatient ON code) and (no prior codes for OA) 13 (15%) 100% 46% 150 69
  1. OA, osteoarthritis; ON, osteonecrosis; PPV, positive predictive value.