Skip directly to search Skip directly to A to Z list Skip directly to site content
CDC Home

Volume 17, Number 8—August 2011

CME ACTIVITY

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 G. 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

Top of Page

USA.gov: The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30333, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC–INFO