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. 2004 Jun;39(3):511–530. doi: 10.1111/j.1475-6773.2004.00242.x

Table 3.

Comparison of the HMO's 1996 HEDIS Scores and the PI Scores1 for Services Included in Both

1996 Prevention Index Observation Interval1
Service 1996 HEDIS 1997 HEDIS 1 year 2 year 3 year 4 year 5 year
Mammography 77.7 76.5 13 34 34 34 34
Cervical Cancer Screen 76.3 76.5 18 45 51 54 54
1

PI scores calculated separately for observation periods of one to five years. Mammography quality stable with two years of data; Pap smear quality required four years (target period plus one service interval) to stabilize.