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Table 6 Multivariate logistic regression on proportion of infection or plus clinical morbidity among household contacts during three consecutive influenza seasons

From: Geographical heterogeneity and influenza infection within households

   Any 4-fold increase$ p Any 4-fold increase plus any symptoms$ p
Children      
1st Year Rural v.s urban 1.03 (0.79,1.34) 0.835 0.93 (0.76,1.13) 0.458
Household size 0.97 (0.85,1.11) 0.692 0.96 (0.87,1.06) 0.385
TIV previous year 0.72 (0.42,1.22) 0.221 0.97 (0.76,1.25) 0.831
TIV (-) v.s (+) 1.26 (0.93,1.70) 0.139 1.27 (1.03,1.56) 0.024*
2nd Year Rural v.s urban 0.95 (0.79,1.13) 0.547 0.93 (0.76,1.14) 0.505
Household size 1.01 (0.81,1.27) 0.901 1.00 (0.79,1.27) 0.997
TIV previous year 0.91 (0.60,1.38) 0.664 1.10 (0.70,1.75) 0.672
TIV (-) v.s (+) 1.08 (0.76,1.52) 0.664 1.03 (0.70,1.52) 0.886
TIV partial v.s (+) 1.09 (0.75,1.58) 0.665 1.06 (0.68,1.66) 0.800
3rd Year Rural v.s urban 1.10 (0.96,1.25) 0.171 1.02 (0.84,1.24) 0.834
Household size 1.03 (0.93,1.13) 0.607 1.07 (0.95,1.21) 0.260
TIV this year 1.03 (0.91,1.16) 0.665 0.94 (0.79,1.11) 0.451
TIV (-) v.s (+) 1.09 (0.96,1.24) 0.184 1.13 (0.92,1.38) 0.249
TIV partial v.s (+) 0.91 (0.76,1.09) 0.306 0.85 (0.66,1.08) 0.186
Adults      
1st Year Rural v.s urban 0.98 (0.87,1.21) 0.161 1.02 (0.93,1.12) 0.693
Household size 1.02 (0.97,1.07) 0.444 1.00 (0.97,1.04) 0.806
TIV previous year 1.11 (0.91,1.35) 0.314 0.94 (0.90,0.97) <0.001*
TIV (-) v.s (+) 1.01 (0.91,1.12) 0.878 0.99 (0.92,1.06) 0.726
2nd Year Rural v.s urban 0.89 (0.82,0.97) 0.006* 0.91 (0.84,0.99) 0.024*
Household size 0.89 (0.80,1.00) 0.046* 0.99 (0.90,1.08) 0.762
TIV previous year 0.98 (0.83,1.16) 0.809 1.08 (0.92,1.28) 0.342
TIV (-) v.s (+) 0.95 (0.85,1.06) 0.359 0.98 (0.89,1.08) 0.688
TIV partial v.s (+) 1.07 (0.94,1.23) 0.303 1.02 (0.91,1.16) 0.700
3rd Year Rural v.s urban 0.85 (0.75,0.96) 0.010* 0.87 (0.77,0.99) 0.031*
Household size 1.03 (0.93,1.13) 0.620 1.05 (0.94,1.18) 0.385
TIV previous year 1.08 (0.91,1.30) 0.381 0.96 (0.80,1.14) 0.627
TIV (-) v.s (+) 0.94 (0.81,1.09) 0.423 0.95 (0.82,1.10) 0.476
TIV partial v.s (+) 0.99 (0.83,1.19) 0.919 0.92 (0.75,1.12) 0.402
  1. $Odds ratio (95% confidence interval).
  2. *p < 0.05.