Table 3

Results of segmented regression analysis of antipsychotic prescribing patterns within defined subgroups

Estimate (%)LCLUCLP values
Patient characteristics
 History of psychosis
  Intercept72.13071.64872.613<0.0001
  Monthly change before0.069−0.0370.1740.1887
  Immediate change after newspaper article−0.674−1.217−0.1310.0167
  Additional monthly change after newspaper article−0.192−0.303−0.0810.0015
  Immediate change after CIHI report−0.862−1.467−0.2570.0069
  Additional monthly change after CIHI report0.057−0.0370.1500.2219
 No history of psychosis
  Intercept30.67530.49630.855<0.0001
  Monthly change before−0.020−0.0590.0200.3095
  Immediate change after newspaper article−1.298−1.500−1.096<0.0001
  Additional monthly change after newspaper article−0.202−0.243−0.161<0.0001
  Immediate change after CIHI report−0.458−0.683−0.2330.0003
  Additional monthly change after CIHI report0.0600.0260.0950.0015
 Female resident
  Intercept31.51531.31431.715<0.0001
  Monthly change before−0.014−0.0580.0300.5176
  Immediate change after newspaper article−1.197−1.423−0.971<0.0001
  Additional monthly change after newspaper article−0.213−0.259−0.166<0.0001
  Immediate change after CIHI report−0.509−0.761−0.2580.0003
  Additional monthly change after CIHI report0.0670.0280.1060.0016
 Male resident
  Intercept35.58235.31535.850<0.0001
  Monthly change before−0.015−0.0740.0430.5906
  Immediate change after newspaper article−1.502−1.802−1.201<0.0001
  Additional monthly change after newspaper article−0.182−0.244−0.121<0.0001
  Immediate change after CIHI report−0.524−0.859−0.1890.0035
  Additional monthly change after CIHI report0.037−0.0150.0890.1533
Physician characteristics
 Female physician
  Intercept32.69032.43832.941<0.0001
  Monthly change before−0.141−0.196−0.086<0.0001
  Immediate change after newspaper article−0.852−1.135−0.569<0.0001
  Additional monthly change after newspaper article−0.107−0.165−0.0490.0008
  Immediate change after CIHI report−0.918−1.233−0.602<0.0001
  Additional monthly change after CIHI report0.0900.0410.1380.0009
 Male physician
  Intercept32.61932.44532.793<0.0001
  Monthly change before0.013−0.0260.0520.5073
  Immediate change after newspaper article−1.377−1.563−1.191<0.0001
  Additional monthly change after newspaper article−0.217−0.255−0.179<0.0001
  Immediate change after CIHI report−0.373−0.582−0.1640.0012
  Additional monthly change after CIHI report0.0430.0130.0730.0073
 Small panel
  Intercept34.87533.79735.953<0.0001
  Monthly change before−0.291−0.536−0.0460.0219
  Immediate change after newspaper article−0.452−1.5280.6250.3935
  Additional monthly change after newspaper article0.082−0.1550.3200.4808
  Immediate change after CIHI report−0.634−1.8940.6270.308
  Additional monthly change after CIHI report0.139−0.0440.3220.1285
 Large panel
  Intercept32.57832.42332.732<0.0001
  Monthly change before−0.016−0.0500.0190.3565
  Immediate change after newspaper article−1.251−1.418−1.085<0.0001
  Additional monthly change after newspaper article−0.201−0.235−0.167<0.0001
  Immediate change after CIHI report−0.562−0.748−0.377<0.0001
  Additional monthly change after CIHI report0.0520.0260.0790.0005
Nursing home characteristic
 Public LTC facility
  Intercept30.58030.37130.789<0.0001
  Monthly change before0.0480.0030.0940.0385
  Immediate change after newspaper article−0.770−1.006−0.535<0.0001
  Additional monthly change after newspaper article−0.232−0.281−0.184<0.0001
  Immediate change after CIHI report−0.422−0.685−0.1600.0027
  Additional monthly change after CIHI report0.009−0.0320.0500.6526
 Private LTC facility
  Intercept34.20634.02434.388<0.0001
  Monthly change before−0.065−0.106−0.0240.0032
  Immediate change after newspaper article−1.609−1.810−1.408<0.0001
  Additional monthly change after newspaper article−0.182−0.222−0.141<0.0001
  Immediate change after CIHI report−0.566−0.789−0.343<0.0001
  Additional monthly change after CIHI report0.1020.0700.134<0.0001
  • CIHI, Canadian Institute for Health Information; LCL, lower control limit; LTC, long-term care; UCL, upper control limit.