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Table 1 Segmented negative binomial regression analysis of IHD morbidity and mortality trends by sex comparing the county of Västerbotten (intervention) with three control counties (Norrbotten, Västernorrland and Jämtland) of Northern Sweden during the period 1987–2013

From: Do cardiovascular disease prevention programs in northern Sweden impact on population health? An interrupted time series analysis

  IHD morbidity IHD mortality
Men Women Men Women
RR (95% CI) RR (95% CI) RR (95% CI) RR (95% CI)
Initial mean level difference 1.168 (1.095, 1.246)* 1.213 (1.107, 1.329)* 1.186 (1.089, 1.292)* 1.071 (0.837, 1.371)
Pre-trend Västerbotten 0.949 (0.938, 0.959)* 0.954 (0.948, 0.960)* 0.925 (0.909, 0.940)* 0.954 (0.913, 0.996)*
Pre-trend Norrland 0.969 (0.963, 0.976)* 0.976 (0.963, 0.990)* 0.950 (0.943, 0.957)* 0.965 (0.947, 0.982)*
Pre-trend difference 0.979 (0.966, 0.992)* 0.978 (0.963, 0.992)* 0.973 (0.956, 0.991)* 0.989 (0.943, 1.036)
Level difference 1.024 (0.944, 1.110) 0.981 (0.906, 1.061) 0.978 (0.856, 1.117) 1.004 (0.811, 1.243)
Post-trend Västerbotten 0.976 (0.973, 0.979)* 0.969 (0.964, 0.974)* 0.952 (0.945, 0.959)* 0.942 (0.930, 0.953)*
Post-trend Norrland 0.982 (0.977, 0.987)* 0.979 (0.976, 0.982)* 0.955 (0.948, 0.962)* 0.952 (0.947, 0.957)*
Post-trend difference 0.994 (0.989, 0.999)* 0.990 (0.984, 0.996)* 0.997 (0.987, 1.007) 0.989 (0.976, 1.002)
Pre-Post trend difference 1.016 (1.001, 1.030)* 1.013 (0.996, 1.029) 1.024 (1.004, 1.046)* 1.000 (0.953, 1.050)
  1. *significant at p < 0.05