Table 3

Interrupted time series segmented regression results for clinical outcomes of female patients before and after the implementation of the BTF programme (T1: 2007–2009; T2: 2010–2013)

Clinical outcomes18–34 years35–54 years55–74 years≥75 yearsTotal95% CI
RR95% CIRR95% CIRR95% CIRR95% CIRR
IHCA incidence: /1000 admissions
 Trend since baseline (T1)0.988(0.974 to 1.003)0.998(0.987 to 1.008)0.990*(0.982 to 0.998)0.982†(0.974 to 0.989)0.986†(0.981 to 0.992)
 Change of trend since BTF (∆T)1.016(0.997 to 1.036)0.999(0.986 to 1.012)0.998(0.989 to 1.007)1.009(0.999 to 1.019)1.005(0.997 to 1.013)
 Intercept (BTF: yes/no)1.236(0.804 to 1.903)0.863(0.643 to 1.160)1.305‡(1.073 to 1.586)1.104(0.954 to 1.277)1.132*(1.002 to 1.279)
IHCA survival to discharge: %
 Trend since baseline (T1)0.969*(0.946 to 0.993)1.000(0.991 to 1.008)1.005(0.995 to 1.014)1.010(0.998 to 1.022)1.005(0.997 to 1.013)
 Change of trend since BTF (∆T)1.044‡(1.016 to 1.073)1.003(0.992 to 1.015)1.001(0.990 to 1.012)0.993(0.977 to 1.009)0.999(0.989 to 1.009)
 Intercept (BTF: yes/no)1.653(0.806 to 3.390)1.203(0.908 to 1.593)0.929(0.745 to 1.160)1.037(0.785 to 1.371)1.026(0.864 to 1.217)
1-year post-discharge mortality after surviving an IHCA: %
 Trend since baseline (T1)2.913(0.004 to 2365)1.029(0.981 to 1.080)1.001(0.982 to 1.020)0.993(0.978 to 1.008)0.999(0.990 to 1.008)
 Change of trend since BTF (∆T)0.348(0.004 to 30.21)0.979(0.928 to 1.032)1.006(0.977 to 1.036)0.997(0.978 to 1.015)1.001(0.987 to 1.015)
 Intercept (BTF: yes/no)0(-)0.567(0.173 to 1.864)0.763(0.438 to 1.331)1.181(0.728 to 1.916)0.900(0.646 to 1.254)
IHCA mortality: /1000 admissions
 Trend since baseline (T1)1.005(0.987 to 1.022)0.998(0.985 to 1.010)0.987*(0.976 to 0.998)0.979†(0.970 to 0.989)0.984†(0.976 to 0.992)
 Change of trend since BTF (∆T)0.990(0.968 to 1.012)0.995(0.977 to 1.013)0.997(0.983 to 1.010)1.011(0.997 to 1.025)1.005(0.993 to 1.016)
 Intercept (BTF: yes/no)0.972(0.518 to 1.824)0.755(0.495 to 1.151)1.386*(1.065 to 1.804)1.081(0.894 to 1.306)1.119(0.958 to 1.308)
DLMDRG: /1000 admissions
 Trend since baseline (T1)0.976(0.929 to 1.025)1.039‡(1.015 to 1.063)0.994(0.983 to 1.006)1.002(0.995 to 1.009)1.002(0.996 to 1.008)
 Change of trend since BTF (∆T)1.036(0.986 to 1.087)0.951†(0.926 to 0.977)0.999(0.985 to 1.014)0.992*(0.984 to 0.999)0.992*(0.986 to 0.998)
 Intercept (BTF: yes/no)1.522(0.319 to 7.265)0.592(0.335 to 1.046)1.074(0.746 to 1.544)0.929(0.779 to 1.107)0.928(0.782 to 1.101)
Hospital mortality: /1000 admissions
 Trend since baseline (T1)0.999(0.986 to 1.012)1.000(0.995 to 1.005)0.996*(0.993 to 0.999)0.997‡(0.995 to 0.999)0.997†(0.995 to 0.998)
 Change of trend since BTF (∆T)1.000(0.986 to 1.015)0.997(0.990 to 1.003)1.000(0.996 to 1.003)1.000(0.997 to 1.003)1.000(0.998 to 1.002)
 Intercept (BTF: yes/no)1.049(0.778 to 1.415)1.017(0.886 to 1.167)1.092*(1.021 to 1.169)0.989(0.934 to 1.047)1.016(0.971 to 1.064)
  • The full Poisson model marital status, country of birth, socio-economic status, calendar month (January–December), residential area (urban vs rural and regional), private health insurance status (full vs basic vs none) and hospital peer group (A–D and F) as; A: Principal Referral Group: acute hospitals, treating 25 000 or more acute casemix weighted separations per annum, with an average cost weight greater than 1; B: Major hospitals: acute hospitals, treating 10 000 or more acute casemix weighted separations per annum, but having less than 25 000 acute casemix weighted separations or an average casemix weight of less than 1; or acute hospitals treating 10 000 or more acute casemix weighted separations per annum that are located in rural areas providing acute specialist and referral services for a catchment population from a large geographical area; C: District Group: acute hospitals, treating 2000 or more, but less than 10 000 acute casemix weighted separations per annum; D: Hospitals treating less than 2000 acute casemix weighted separations per annum. F: All other public health facility including the subacute and residential care facilities.

  • *p<0.05.

  • †p<0.001.

  • ‡p<0.01.

  • BTF, Between the Flags; DLMDRG, deaths in low-mortality diagnostic-related group; IHCA, in-hospital cardiopulmonary arrest; ITS, interrupted time series.