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Table 1 Regression modeled estimates of trends in malaria cases at all sentinel sites

From: A description of malaria sentinel surveillance: a case study in Oromia Regional State, Ethiopia

Model N (facility-month observations) Coefficient Incidence rate ratio Standard error p-value
All cases linear trend 1528 Year (Linear trend) 0.85 .006 <0.001
All cases year factor 1528 Year 2010 Ref - -
Year 2011 1.04 .014 0.010
Year 2012 .71 .011 <0.001
Year 2013 .78 .028 <0.001
P. falciparum cases linear trend 1528 Year .87 .009 <0.001
P. falciparum cases year factor 1528 Year 2010 Ref - -
Year 2011 1.19 .024 <0.001
Year 2012 .74 .017 <0.001
Year 2013 .99 .065 0.860
P. vivax cases linear trend 1528 Year (Linear trend) .80 .008 <0.001
P. vivax cases year factor 1528 Year 2010 Ref - -
Year 2011 .85 .017 <0.001
Year 2012 .65 .014 <0.001
   Year 2013 .46 .023 <0.001
  1. All regression models include month of the year as a factor variable, and random intercepts at both the primary health care unit level and the health facility level.