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Table 2 Predictors of the number of secondary cases in the household, offset against the number of potentially exposed household members (participant primay case, 177 household ILI events)

From: Household transmission of respiratory viruses – assessment of viral, individual and household characteristics in a population study of healthy Australian adults

Explanatory variable

SHAP for group (# episodes)

Multivariate Poisson regression

IRR (95% CI)

p

Virus Group (cf none detected)

None

0.129 (95)

1.00 (def)

-

Picornavirus

0.143 (40)

0.937 (0.475, 1.85)

0.851

Influenza

0.238 (17)

2.11 (0.992, 4.49)

0.052

Coronavirus

0.357 (6)

1.80 (0.670, 4.85)

0.243

Other

0.000 (8)

-

-

Sex (cf male)

Male

0.085 (69)

1.00 (def)

-

Female

0.172 (108)

2.12 (1.10, 4.09)

0.025

Smoking (cf not current smoker)

Not current smoker

0.136 (161)

1.00 (def)

-

Current smoker

0.250 (12)

1.91 (0.738, 4.94)

0.183

Age (cf 18–24 years)

18-24 years

0.106 (47)

Not included

-

25-34 years

0.115 (28)

Not included

-

35-44 years

0.235 (37)

Not included

-

45-54 years

0.095 (36)

Not included

-

55-64 years

0.100 (29)

Not included

-

Household size (cf size 2)

2

0.219 (64)

Not included

-

3

0.068 (44)

Not included

-

4

0.123 (46)

Not included

-

5

0.206 (17)

Not included

-

6

0.200 (3)

Not included

-

7

0.000 (3)

Not included

-

Presence of child (cf no children in house)

No children in house

0.118 (123)

1.00 (def)

-

At least one child in house

0.167 (54)

1.51 (0.864, 2.65)

0.147