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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.