Table 3 Multivariate regression of laboratory-confirmed influenza versus demographic and clinical variables for subjects 6–49 years

Intercept term

−5.85

<.001

Age (years)

−0.00

1.00 (0.98–1.02)

.713

Sex

0.13

.606

Female

1.14 (0.70–1.84)

Male^a

1.0

Acute onset

1.18

<.001

≤3 days

3.26 (2.09–5.10)

>3 days^a

1.0

Fever

1.35

<.001

>38.0°C

3.84 (2.23–6.61)

≤38.0°C^a

1.0

Cough

3.87

<.001

Yes

47.99 (6.29–366.13)

No^a

1.0

Body aches

0.95

.001

Yes

2.59 (1.47–4.54)

No^a

1.0

Vaccinated

−1.10

.001

Yes

0.33 (0.18–0.62)

No^a

1.0