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Tables 1 Crude RRs and 95% Cls for potential risk factors related to norovirus outbreaks in Hong Kong elderly homes

From: Institutional risk factors for norovirus outbreaks in Hong Kong elderly homes: a retrospective cohort study

Factors Home-years Outbreaks RR 95% CI P value
Home capacity (per 30-resident increment)    1.5 1.4-1.6 <0.0001
Staff-to-resident ratio (per 1/30 increment)    1.2 1.1-1.3 <0.0001
% residents older than 75 yrs (per additional 10%)    1.2 1.1-1.3 0.0003
% bedridden residents (per additional 10%)    0.9 0.8-1.0 0.07
Infection control training      
   No 1024 1 1   
   Yes 8259 275 3.5 0.5-25.6 0.2
Visits by CGAT      
   No 15302 41 1   
   Yes 6831 235 1.3 0.9-2.0 0.2
Visits by medical officers      
   No 267 14 1   
   Yes 8094 262 0.6 0.3-1.1 0.1
Isolation area      
   No 2865 101 1   
   Yes 5496 175 0.9 0.7-1.2 0.5
Air conditioner supply      
   No 157 12 1   
   Yes 8204 264 0.4 0.2-1.1 0.1
Hygiene condition of toilets      
   High 113 2 1   
   Low 8248 274 1.9 0.5-7.4 0.3
Hygiene condition of kitchens      
   High 438 13 1   
   Low 7923 263 1.1 0.7-1.9 0.7
Wheelchair accessibility      
   No 1794 21 1   
   Yes 6567 255 3.5 2.2-5.6 <0.0001
Partition between beds      
   No 2111 151 1   
   Yes 6251 125 0.25 0.19-0.34 <0.0001