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Table 2 Delay in achieving epidemic threshold and correlation between curves and MEM epidemic levels

From: Assessment of two complementary influenza surveillance systems: sentinel primary care influenza-like illness versus severe hospitalized laboratory-confirmed influenza using the moving epidemic method

Influenza season SHLCI / PIDIRAC-ILI SHLCI / PIDIRAC-FLU SHLCI -FLUA / PIDIRAC-FLUA SHLCI -FLUB / PIDIRAC-FLUB
2010_11 1 1 1 na
2011_12 2 2 2 na
2012_13 6 3 na 3
2013_14 1 1 1 na
2014_15 1 2 2 1
2015_16 0 -1 -1 4
2016_17 0 0 0 na
mean ± SD 1.6 ± 2,1 1.1 ± 1.3 0.8 ± 1.2 2.7 ± 1.5
P-value 0.039 0.071 0.129 0.109
Correlation (LN) 0.805 (0.814) 0.694 (0.749) 0.724 (0.743) 0.583 (0.666)
MEM correlation 0.745 0.649 0.752 0.689
Global ILSR 81.0% 77.5% 80.8% 85.9%
Epidemic ILSR 47.4% 38.2% 46.0% 58.8%
  1. Na not available, LN natural logarithm, ILSR Influenza Likelihood Signed Rank, MEM Moving Epidemics Method, SHLCI Severe hospitalized laboratory confirmed influenza, SHLCI-FLUA A Severe hospitalized laboratory confirmed influença type A, SHLCI-FLUA B Severe hospitalized laboratory confirmed influença type B, PIDIRAC-ILI Incidence rate for Primary care inflenza like illness, PIDIRAC-FLU Incidence rate for Primary care influenza laboratory confirmed cases, PIDIRAC-FLUA Incidence rate for Primary care influença type A laboratory confirmed cases, PIDIRAC-FLUB Incidence rate for Primary care influenza type B laboratory confirmed cases