Table 2 The results of interrupted time series analysis for volume (thousand DDD)
Categories | Constant β0(Yt0) | Secular trend β1(Yt1) | Level change β2(Yt2) | Trend change β3(Yt3) |
|---|---|---|---|---|
Drugs under the same generic name | ||||
Bid-winning drugs | 1415.77* (1728.26) | 9.38 (1502.43) | 6344.53*** (6560.82) | 256.05* (9516.16) |
Generic drugs | 5657.35*** (6112.04) | -49.73 (5345.35) | -3455.25*** (2341.37) | 32.70 (1496.59) |
Branded drugs | 6347.83*** (6691.72) | -12.07 (6264.50) | -3103.20*** (3899.19) | 8.71 (3098.93) |
Total | 13200.00*** (14532.02) | 22.47 (13266.23) | 325.97 (19711.14) | 86.26 (14357.97) |
Alternative drugs under different generic names | ||||
Perfect clinical equivalence | 1995.31***(2467.62) | 10.39 (2057.63) | 317.67 (2718.95) | 3.76 (2525.83) |
Fundamental clinical equivalence | 1941.59*** (2170.93) | 8.37 (1990.46) | -109.23 (2444.98) | 58.4* (2325.32) |
Limited clinical equivalence | 5205.06*** (5983.09) | 27.00 (5373.02) | -792.40 (6142.75) | 189.23* (5990.98) |
Total | 9114.10*** (10621.64) | 49.01 (9421.11) | -569.64 (11306.68) | 240.48 (10842.14) |