Table 2.

Trends in Promoted Drug Prescribing Before and After Policy Implementation at Madras Medical Group (MMG) Alone and Relative to Control

MMG TrendMMG Relative to Control
PrescribingEstimate %95% CIP ValueEstimate %95% CIP Value
a Changes after policy implementation.
Note: Baseline level = prescribing rate at month 1 (April 2004); pre trend = monthly change in prescribing rate in period before policy implementation; level change = change in prescribing rate immediately before policy implementation (September 2005) to immediately after policy implementation (April 2006); post trend = monthly change in prescribing rate in period after policy implementation. MMG relative to control estimates are interpreted similarly, but adjusted for concurrent prescribing trends in the control group.
Aggregate promoted
    Baseline level10.009.46 to 10.54<.001
    Pre trend0.02−0.03 to 0.06.550−0.04−0.10 to 0.02.163
    Level changea−0.46−1.38 to 0.46.339−1.43−2.53 to −0.33.013
    Post trenda−0.19−0.31 to −0.07<.001−0.01−0.15 to 0.14.389
Aggregate nonpromoted
    Baseline level31.1229.83 to 32.41<.001
    Pre trend−0.35−0.47 to −0.23<.001−0.10−0.25 to 0.06.219
    Level changea2.190.15 to 4.23.0443.040.39 to 5.69.028
    Post trenda−0.19−0.48 to 0.10.086−0.20−0.57 to 0.18.378
Antidepressants
    Baseline level25.8322.40 to 29.26<.001
    Pre trend0.04−0.27 to 0.35.803−0.33−0.88 to 0.23.258
    Level changea−5.05−10.64 to 0.54.086−11.34−20.67 to −2.01.020
    Post trenda−0.61−1.38 to 0.16.0090.71−0.67 to 2.10.016
Antihypertensives
    Baseline level11.5810.29 to 12.87<.001
    Pre trend0.110.00 to 0.23.066−0.02−0.33 to 0.28.889
    Level changea1.60−0.46 to 3.66.138−2.11−7.03 to 2.81.404
    Post trenda−0.36−0.65 to −0.07<.0010.21−0.55 to 0.97.325
Lipid–lowering drugs
    Baseline level62.4559.88 to 65.02<.001
    Pre trend−0.07−0.31 to 0.17.572−0.32−0.69 to 0.05.094
    Level changea−3.36−7.81 to 1.09.150−9.98−16.80 to −3.16.006
    Post trenda−0.66−1.24 to −0.09.002−0.30−1.18 to 0.59.932
Respiratory drugs
    Baseline level48.5143.43 to 53.59<.001
    Pre trend−0.48−0.95 to −0.01.053−0.73−1.27 to −0.18.012
    Level changea2.11−6.59 to 10.81.6383.88−6.21 to 13.97.454
    Post trenda−0.10−1.23 to 1.03.2720.03−1.29 to 1.35.060