Skip directly to site content Skip directly to page options Skip directly to A-Z link Skip directly to A-Z link Skip directly to A-Z link
Volume 17, Number 8—August 2011
CME ACTIVITY - Research

Risk Factors for Pandemic (H1N1) 2009 Seroconversion among Adults, Singapore, 2009

Wei-Yen LimComments to Author , Cynthia H.J. Chen, Yi Ma, Mark I.C. Chen, Vernon J.M. Lee, Alex R. Cook, Linda W.L. Tan, Norberto Flores Tabo, Ian Barr, Lin Cui, Raymond T.P. Lin, Yee Sin Leo, and Kee Seng Chia
Author affiliations: Author affiliations: National University of Singapore, Singapore (W.-Y. Lim, C.H.J. Chen, Y. Ma, M.I.C. Chen, V.J.M. Lee, L.W.L. Tan, N. Flores Tabo, Jr., K.S. Chia); Tan Tock Seng Hospital, Singapore (M.I.C. Chen, Y.S. Leo); Ministry of Defence, Singapore (V.J.M. Lee); National University of Singapore, Singapore (A.R. Cook); World Health Organization Collaborating Centre for Reference and Research on Influenza, Melbourne, Victoria, Australia (I. Barr); Ministry of Health, Singapore (L. Cui, R.T.P. Lin)

Main Article

Table

Comparison of participants who provided follow-up blood samples with cohort at start of study of risk factors for pandemic (H1N1) 2009 seroconversion, Singapore, 2009*

Characteristic Total, n = 828 Respondents, n = 727
Age, y, mean (SD)
43.4 (12.0)
43.6 (11.8)
Age group, y
20–29 149 (18.0) 124 (17.1)
30–39 131 (15.8) 113 (15.5)
40–49 285 (34.4) 260 (35.8)
50–59 175 (21.1) 155 (21.3)
>60
88 (10.6)
75 (10.3)
Sex
F 482 (58.2) 432 (59.4)
M
346 (41.8)
295 (40.6)
Ethnicity
Chinese 94 (11.4) 90 (12.4)
Malay 374 (45.2) 331 (45.5)
Indian 353 (42.6) 299 (41.1)
Other
7 (0.9)
7 (1.0)
Dwelling type
<3-room public housing 202 (24.4) 177 (24.3)
4-room public housing 360 (43.5) 310 (42.6)
5-room public housing or
private housing
266 (32.1)
240 (33.0)
Smoking
Current smoker 181 (21.9) 149 (20.5)
Nonsmoker/former smoker
647 (78.1)
578 (79.5)
No. household members
1 580 (70.1) 496 (68.2)
2 208 (25.1) 195 (26.8)
3 36 (4.4) 33 (4.5)
4
4 (0.5)
3 (0.4)
Self-reported previous influenza vaccination
No 751 (90.7) 662 (91.1)
Yes
77 (9.3)
65 (8.9)
Employment outside the home
No 308 (37.2) 277 (38.0)
Yes
520 (62.8)
450 (62.0)
Baseline antibody titer
Mean (SD) 0.22 (0.71) 0.25 (0.75)
By age group, y
20–29 0.48 (1.06)
30–39 0.19 (0.58)
40–49 0.17 (0.59)
50–59 0.28 (0.84)
>60

0.12 (0.52)
Public transport
Seldom 294 (35.5) 249 (34.3)
Frequent 534 (64.5) 478 (65.7)

*Values are no. (%) except as indicated. Respondents are participants who provided at least 1 blood sample in addition to that obtained at baseline.

Main Article

Page created: September 01, 2011
Page updated: September 01, 2011
Page reviewed: September 01, 2011
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
file_external