Table 3 Multivariate logistic regression analyses for SCR and SPR

H1N1

 Age, years

0.971 (0.944–0.999)

0.042

0.996 (0.965–1.027)

0.794

0.964 (0.923–1.007)

0.096

 IV history

0.153 (0.064–0.366)

 < 0.001

7.794 (3.452–17.595)

 < 0.001

0.357 (0.114–1.112)

0.076

 Pre-vaccination HAI

0.997 (0.988–1.007)

0.598

——

——

1.184 (1.089–1.287)

 < 0.001

H3N2

 Age, years

0.998 (0.971–1.027)

0.908

1.007 (0.974–1.040)

0.693

1.019 (0.985–1.053)

0.274

 IV history

0.691 (0.312–1.533)

0.363

1.655 (0.694–3.946)

0.256

0.574 (0.231–1.425)

0.231

 Pre-vaccination HAI

0.911 (0.877–0.946)

 < 0.001

——

——

1.063 (1.014–1.115)

0.012

B/Victoria

 Age, years

0.964 (0.937–0.992)

0.011

1.017 (0.986–1.050)

0.286

0.948 (0.901–0.997)

0.038

 IV history

0.919 (0.413–2.044)

0.835

2.21 (0.980–4.985)

0.056

0.329 (0.092–1.170)

0.086

 Pre-vaccination HAI

0.973 (0.958–0.989)

0.001

——

——

1.153 (1.052–1.264)

0.002

B/Yamagata

 Age, years

0.985 (0.956–1.016)

0.343

0.93 (0.898–0.963)

 < 0.001

0.742 (0.550–1.001)

0.051

 IV history

0.381 (0.170–0.855)

0.019

5.868 (2.357–14.610)

 < 0.001

0.013 (0.000–10.369)

0.203

 Pre-vaccination HAI

0.983 (0.972–0.994)

0.003

——

——

1.27 (0.981–1.643)

0.069