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*
, Mason Lau*, Jean H. Kim*, Eric Wong*, Hi-Yi Tsui*, Thomas Tsang†, and Tze Wai Wong‡
, Mason Lau*, Jean H. Kim*, Eric Wong*, Hi-Yi Tsui*, Thomas Tsang†, and Tze Wai Wong‡
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.
Page created: February 03, 2011
Page updated: February 03, 2011
Page reviewed: February 03, 2011
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