Other groups up for grabs include Devout Catholics (white non-Hispanic Catholics who attend Mass weekly), Aging Blues (men or women over 50 without college degrees) and the Young and the Restless (whites under 30).
The virology data were then aggregated into weekly age-specific numbers of positive specimens for each virus.
We found that the locus indeed coincided with QTL affecting weekly age-specific mortality during, and beyond, the lethal phase.
We obtained weekly age-specific ILI incidence rates during 2004 2010 from a systematic national surveillance system in Chile (13 ).
In addition to mean life span, we analysed weekly age-specific mortality (μ x ), as estimated by (4) μ x = -ln(P x ) where P x is the proportion of surviving individuals from week × to week x+1.
Samples were tested for 2009 influenza A virus (H1N1) by means of reverse-transcriptase polymerase chain reaction (RT-PCR) (24 ), producing weekly age-stratified data on the proportion of ILI samples positive for H1N1-2009.
Confounding was adjusted for by adding weekly age-specific positive isolate numbers of other respiratory viruses (RSV, adenovirus and parainfluenza), long term and seasonal trends, temperature and relative humidity, as previously described [ 10].
Poisson regression models were fitted to weekly numbers of non-accidental hospitalization for the age groups of 0 4, 5 14, 15 29, 30 39, 40 49, 50 59 and 60 or over (60+) years, with the influenza proxy variables of weekly age-specific numbers of positive specimens for A(H1N1), A(H3N2), B and A(H1N1 pdm09 simultaneously entered.
Weekly age-specific numbers of positive specimens for influenza A(H1N1 pdm09, seasonal A(H1N1), A(H3N2), influenza B, respiratory syncytial virus (RSV), adenovirus and parainfluenza were aggregated into the age groups of 0 4, 5 17, 18 64, and 65+ years during 2004 to 2013.
