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

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

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%

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

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