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Table 2 Ct values in genogroup II norovirus positive IID cases and healthy controls.

From: Diagnosing norovirus-associated infectious intestinal disease using viral load

Method of norovirus detection IID Cases Controls Rank-sum test p-value
comparing cases to controls
  Median Ct
value
Ct value
IQR
Sample
size
Median Ct
value
Ct value
IQR
Sample
size
 
All ages        
   All 34 25–37 589 38 35–39 159 <0.0001
   Electron microscopy 24 21–27.5 92     <0.0001
RT-PCR
(Electron microscopy negative)
35 29–38 497     <0.0001
< 5 years        
   All 34 26–37 253 37 34–38 92 <0.0001
   Electron microscopy 23 21–25 48     <0.0001
RT-PCR
(Electron microscopy negative)
35 32–37 205     0.0001
5 years +        
   All 34 25–38 334 38 36–39 67 <0.0001
   Electron microscopy 25 22–28.5 44     <0.0001
RT-PCR
(Electron microscopy negative)
35 27–38 290     <0.0001
  1. The rank-sum tests for electron microscopy and RT-PCR positive IID cases compare them to all controls. Age was not recorded for two IID cases. IQR is the interquartile range.