Table 6

Interrupted time-series analysis with ARIMA error model for SUS hospital admission rate for myocardial infarction, city of Sao Paulo, Brazil, January 2005 to December 2010

Input seriesLag*EstimateSEp Value
Total hospital admission (n)00.00030.00014<0.001
Minimum air temperature (°C)0−0.14880.02660<0.001
Air relative humidity (%)70.04090.01180.001
COmax (ppm)†50.19530.12860.118
Pre-intervention trend0−0.16330.00550.003
Smoking ban law (I)‡00.08070.34600.815
Pos-intervention trend0−0.04250.03400.211
ARIMA error structure
Autorregressive14−0.52410.1096<0.001
  • *Month.

  • †Maximum carbon monoxide level for each 8 hours.

  • ‡Smoking ban law (starting in August 2009). Step function intervention, 1 if t≥T; 0 otherwise.