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Volume 10, Number 8—August 2004

Research

SARS in Three Categories of Hospital Workers, Hong Kong

Joseph T.F. Lau*Comments to Author , Xilin Yang*, P.C. Leung*, Louis Chan*, Eliza Wong*, Carmen Fong*, and H.Y. Tsui*
Author affiliations: *The Chinese University of Hong Kong, Hong Kong, China

Main Article

Table 3

Attack rate among hospitals by job categories and time period

Hospital no. Group N
Group S
Group O
Overalla
Onset before 7/4 (%) Onset after 7/4 (%) Onset before 7/4 (%) Onset after 7/4 (%) Onset before 7/4 (%) Onset after 7/4 (%) Onset before 7/4 (%) Onset after 7/4 (%)
1
0.00
0.00
0.00
0.00
0.36
0.36
0.09
0.09
2
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
3
0.40
0.80
0.00
0.96
0.00
0.00
0.20
0.60
4
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
5
0.00
0.33
0.43
0.86
0.00
0.00
0.16
0.48
6
0.00
0.95
0.28
0.55
0.23
0.00
0.13
0.58
7
0.00
0.12
0.00
0.00
0.00
0.00
0.00
0.07
8
0.26
0.00
0.90
0.91
0.41
0.00
0.40
0.14
9
0.42
0.00
1.11
0.00
0.18
0.00
0.50
0.00
10
0.26
0.26
0.19
0.96
0.00
0.00
0.17
0.31
11
0.47
0.00
1.41
0.00
0.14
0.00
0.54
0.00
12
3.38
0.21
6.44
0.53
1.02
0.34
3.31
0.31
13
0.87
0.00
1.42
0.00
0.00
0.00
0.68
0.00
14
1.01
0.00
2.88
0.49
0.13
0.13
1.05
0.12
15
4.08
0.61
11.82
1.68
0.21
0.00
3.87
0.53
16
2.36
0.40
3.27
0.68
1.07
0.46
2.18
0.47
Pooled (16 hospitals)
0.99
0.22
2.24
0.50
0.21
0.07
0.98
0.22
Ratio of pooled rates (phase 1 vs. 2)
4.50:1

4.48:1

3.00:1

4.45:1

p values (among 16 hospitals) < 0.001b < 0.001c < 0.001c 0.036c 0.002c 0.048c < 0.001b < 0.001c

aOverall: all the hospital workers, including all three groups (N, S, and O).
bPearson Chi-square test.
cFisher-Freeman-Halton test.

Main Article

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