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Table 5 Quantile regressions on monthly growth of TZD prescriptions, (n = 327 long-term adopters)

From: Diffusion patterns of new anti-diabetic drugs into hospitals in Taiwan: the case of Thiazolidinediones for diabetes

  Speed of TZD prescription (Monthly Growth on Total DDD of TZD)    Speed of TZD prescription (Monthly Growth on Total DDD of TZD)    Speed of TZD prescription (Monthly Growth on Total DDD of TZD)   
  25% quantile    50% quantile    75% quantile   
  Coefficient 95% CI   Coefficient 95% CI   Coefficient 95% CI  
Intercept 57.14 (-73.90 149.35)   143.87 (-125.85 474.82)   248.98 (-142.24 1045.51)  
Initial time to adoption of TZD in month 0.60 (-0.17 0.99 )   0.47 (-0.81 0.82)   0.13 (-0.57 1.86)  
log (total DDD of DM in February, 2001) 18.29 (12.14 27.75) * 25.57 (14.74 34.87) * 30.97 (17.17 40.80) *
HHI in February, 2001(unit: HHI*100) -7.88 (-55.35 45.67)   10.81 (-78.56 90.25)   67.73 (-46.51 180.98)  
Number of doctors who prescribed TZD 2.65 (0.71 4.49 ) * 3.14 (1.44 5.20) * 4.25 (1.19 6.30) *
Accreditation level          
   Ref: Medical Center          
   Regional Hospital -193.39 (-355.21 396.19)   -326.44 (-577.59 -35.84) * -295.57 (-962.53 159.11)  
   District Hospital -249.47 (-410.38 451.57)   -394.48 (-647.42 -101.94) * -486.58 (-1351.85 -32.69) *
NHI Regions          
   Ref: Taipei          
   Northern -20.33 (-30.27 -1.70) * -23.94 (-58.11 52.29)   -11.05 (-93.18 51.03)  
   Central 2.85 (-4.73 15.90)   18.64 (-34.77 49.89)   -40.12 (-89.09 -2.39) *
   Southern 6.93 (-10.92 20.61)   7.90 (-23.38 45.70)   -22.49 (-67.47 119.84)  
   Kao-Ping -4.05 (-18.10 10.18 )   2.64 (-37.65 32.81)   -69.48 (-112.26 -16.17) *
   Eastern -38.15 (-60.45 -27.91) * -71.45 (-104.30 -50.74) * -114.75 (-171.58 - 36.97)  
Ownership          
   Ref: Public Hospital          
   Non-profit Hospital 74.52 (42.13 95.49) * 103.08 (30.75 130.09) * 73.89 (-0.08 145.26)  
   Private Hospital 53.95 (30.05 71.65) * 66.10 (12.52 91.35) * 77.15 (37.58 112.26) *
  1. *: the 95% confident interval doesn't contain zero