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Volume 10, Number 2—February 2004
THEME ISSUE
2004 SARS Edition
SARS Transmission

Probable Secondary Infections in Households of SARS Patients in Hong Kong

Joseph T.F. Lau*Comments to Author , Mason Lau*, Jean H. Kim*, Eric Wong*, Hi-Yi Tsui*, Thomas Tsang†, and Tze Wai Wong‡
Author affiliations: *Chinese University of Hong Kong, Hong Kong Special Administrative Region, People’s Republic of China (SAR); †Department of Health, Hong Kong SAR; ‡Chinese University of Hong Kong, Department of Community and Family Medicine, Hong Kong SAR

Main Article

Table 4

Univariate analysis of associations between risk factors and Household Attack Rates (HAR)

Risk factor Any probable secondary case within the household (%)
Odds ratio (95% CI) Chi-square
p valuea
Yes No
Sex of index person (IP)




Male (n = 400)
16.5
83.5
1.00
0.215
Female (n = 481)
13.5
86.5
0.79 (0.55 to 1.15)

Age of IP (y)a




<30 (n = 283)
7.4
92.6
1.00
<0.001
31–40 (n = 197)
11.2
88.8
1.57 (0.84 to 2.93)

41–50 (n = 165)
19.4
80.6
3.00 (1.67 to 5.41)

51–60 (n = 76)
23.7
76.3
3.87 (1.94 to 7.73)

>61 (n = 138)
23.2
76.8
3.77 (2.08 to 6.83)

Type of IP




Hospital workers (n = 267)
3.7
96.3
1.00
<0.001
Amoy Gardens bock E residents (n = 36)
38.9
61.1
16.35 (6.51 to 41.08)

Amoy Gardens other Block residents (n = 107)
19.6
80.4
6.28 (2.84 to 13.85)

Other community members (n = 471)
18.3
81.7
5.74 (2.93 to 11.26)

Date of IP’s fever onset b




Before March 25 (n = 299)
22.4
77.6
1.00
<0.001
On or after March 25 (n = 581)
11.0
89.0
0.43 (0.29 to 0.62)

Duration IP stayed home between fever onset and hospitalization (d)c




<2 (n = 440)
9.3
90.7
1.00
<0.001
3–5 (n = 268)
15.3
84.7
1.76 (1.11 to 2.79)

>6 (n = 171)
28.7
71.3
3.91 (2.46 to 6.20)

IP visited by any household member during hospitalization?




No (n = 682)
12.6
87.4
1.00
0.001
Yes (n = 199)
22.6
77.4
2.03 (1.36 to 3.03)

Disinfection of IP’s quarters?




Yes
15.2
84.8
1.00
0.884
No 14.7 85.3 0.96 (0.66 to 1.40)

aExcluded 22 missing persons.
bExcluded 1 missing person.
cExcluded 2 missing persons.

Main Article

Page created: February 03, 2011
Page updated: February 03, 2011
Page reviewed: February 03, 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.
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