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Table 3 ITS results of Fisher Price Index for winning and non-winning products

From: Influence of Chinese National Centralized Drug Procurement on the price of policy-related drugs: an interrupted time series analysis

Item

Coef.

S.E

t

p-value

95% CI

DW

Lower

Upper

Bid-winning products

 Baseline level, β0

0.500

0.006

79.930

0.000

0.486

0.513

1.983

 Baseline trend, β1

− 0.001

0.001

− 0.360

0.725

− 0.004

0.003

 

 Level change, β2

− 0.391

0.010

−41.020

0.000

− 0.411

− 0.370

 

 Trend change, β3

− 0.002

0.002

−1.120

0.280

− 0.006

0.002

 

Non-winning products

 Baseline level, β0

0.491

0.010

49.150

0.000

0.470

0.513

2.172

 Baseline trend, β1

− 0.001

0.002

− 0.500

0.628

− 0.006

0.004

 

 Level change, β2

− 0.034

0.015

−2.190

0.046

−0.067

− 0.001

 

 Trend change, β3

−0.003

0.003

−1.170

0.262

−0.010

0.003

 
  1. Coef. coefficient, S.E standard error, CI confidence interval, DW Durbin-Watson statistic