Table 2:

The unweighted and weighted positive predictive values (PPV) and 95% Confidence intervals (95% CI) for true fracture events. The unweighted PPV are stratified by location of care code position; and ICD code.

Original Algorithm
	N charts detected by algorithm	True Fracture Episode	PPV (95% CI)*
Unweighted PPV	521	383	73.5 (69.5,77.1)
Weighted PPV	521	345	66.3 (58.8,73.1)
Location of Care and Code Position
Inpatient Primary position	5	4	80.0 (11.1,99.2)
Inpatient Second position	8	8	100.0 (100.0,100.0)
Emergency Department Primary position	117	102	87.2 (79.7,92.2)
Emergency Department Second position	50	44	88.0 (75.2,94.7)
Outpatient Primary position	167	125	74.9 (67.6,80.9)
Outpatient Second position	174	100	57.5 (49.9,64.7)
ICD code
ICD9 Unweighted PPV	338	255	75.4 (70.6, 79.8)
ICD9 Weighted PPV	338	205	60.4 (51.2, 69.4)
ICD10 Unweighted PPV	183	128	70.0 (62.9, 76.2)
ICD10 Weighted PPV	183	146	79.9 (72.4, 85.8)
Modified Algorithm after removal of select codes
Unweighted PPV	313	282	90.1 (86.2,93.0)
Weighted PPV	313	286	91.3 (86.87,94.4)
Location of Care and Code Position
Inpatient Primary position	4	4	100 (100, 100)
Inpatient Second position	8	8	100 (100, 100)
Emergency Department Primary position	106	100	94.3 (87.8,97.5)
Emergency Department Second position	46	41	89.1 (75.8,95.6)
Outpatient Primary position	138	118	85.5 (78.5,90.5)
Outpatient Second position	11	11	100 (100,100)
ICD code
ICD9 Unweighted PPV	208	186	89.4 (84.4, 93.0)
ICD9 Weighted PPV	208	190	91.1 (85.0, 94.9)
ICD10 Unweighted PPV	105	96	91.4 (84.2, 95.5)
ICD10 Weighted PPV	105	96	91.7 (83.1, 96.2)

^*Confidence intervals calculated using Poisson regression