Table 4.

Test characteristics of various algorithms examined to determine true POAG (with “glaucoma spectrum” included as true POAG).

Algorithm	Description	PPV (%)	NPV (%)	Sensitivity (%)	Specificity (%)	Percent Agreement (%)
1a.	1+ code (most negative assumptiona)	89.5	95.2	86.6	96.4	93.8
1b.	1+ code (excluding incomplete charts)	95.3	100.0	100.0	98.4	98.8
1c.	1+ code (most positive assumptionb)	95.6	100.0	100.0	98.5	98.9
2	2+ codes	92.8	90.5	70.3	98.1	90.9
3	Meds dispensed	92.0	77.6	54.0	97.1	80.8
4	Meds dispensed and 1+ codes	92.0	77.6	54.0	97.1	80.8
5	Meds dispensed and 2+ codes	93.1	72.7	32.7	98.7	75.2

^aIncomplete charts were coded incorrectly

^bIncomplete charts were coded correctly