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Table 1 Demographics of FRI cases, and non-FRI study controls

From: Risk factors for febrile respiratory illness and mono-viral infections in a semi-closed military environment: a case-control study

Characteristic FRI cases (N = 7743) Percent Non-FRI study controls (N = 1247) Percent P-valuea
Age:
Mean (SD) 20.8 (3.12) 21.0 (2.62) <0.001b
Range 17-60   18-55   
Gender:
Male 7723 99.7 1246 99.9 0.354
Ethnic groups
Chinese 5834 75.4 972 77.9  
Malay 1151 14.9 158 12.7  
Indian 510 6.6 88 7.1  
Others 248 3.2 29 2.3 0.344
Camp
Non-recruit camp 2186 28.2 827 66.3 <0.001
Recruit camp 5557 71.8 420 33.7
Pre-pdm TIV:
Yes 180 2.3 49 3.9 0.002
Post-pdm TIV:
Yes 2400 31.0 279 22.4 <0.001
Pdm-A(H1N1)V:      
Yes 1335 17.2 222 17.8 0.629
Smoking
Non-smoker 5388 69.6 877 70.3  
Current-smoker 2094 27.1 346 27.7  
Ex-smoker 257 3.3 24 1.9 0.028
Asthma
Yes 1598 20.6 215 17.2 0.004
Heart disease
Yes 83 1.1 15 1.2 0.763
Diabetes
Yes 8 0.1 2 0.2 0.656
Hypertension
Yes 45 0.6 6 0.5 0.700
Travelled to community in last 14 days:
Yes 7670 99.1 1238 99.3 0.548
Travelled to other camp in last 14 days:
Yes 471 6.1 177 14.2 <0.001
Travelled overseas in the last 14 days:
Yes 227 2.9 49 3.9 0.057
Camp stay
Stay-in 6928 89.6 1018 81.6 <0.001
  1. aChi-squared test; bunpaired t-test; Pdm- pandemic