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Table 1 Intervention models of ‘abrupt and permanent’ impact on standardised quarterly aeromedical service counts from Tennant Creek, Northern Territory

From: The impacts of withdrawal and replacement of general practitioner services on aeromedical service trends: a 13-year interrupted time-series study in Tennant Creek, Northern Territory

Model 1: Abrupt and permanent impact

 

Intervention A model

+Intervention B model

parameters

coefficient

p-value

coefficient

p-value

Quarterly mean (μ)

5.245

<0.001

5.245

<0.001

Intervention A effect (ω1)

11.710

<0.001

11.771

<0.001

Intervention B effect (ω2)

  

1.326

0.5104

Correlation in residuals (Q6)

4.42

0.6195

11.19

0.0827

Correlation in residuals (Q12)

10.01

0.6153

17.96

0.1168

  1. Intervention A = GP withdrawal; Intervention B = TCGPS introduction