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Volume 9, Number 4—April 2003

Research

The Elderly and Waterborne Cryptosporidium Infection: Gastroenteritis Hospitalizations before and during the 1993 Milwaukee Outbreak

Elena N. Naumova*Comments to Author , Andrey I. Egorov*, Robert D. Morris*, and Jeffrey K. Griffiths*
Author affiliations: *Tufts University School of Medicine, Boston, Massachusetts, USA

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Table 3

Generalized Additive Mode estimates of excess daily rates of gastroenteritis-related emergency room visits and hospitalizations in the elderly in south and central water supply areas during the 1993 outbreak, Milwaukee, Wisconsina

Lag (d) 0.0–0.29 NTUb 0.3–0.49 NTU 0.5–0.99 NTU 1.0–2.0 NTU
0
0.57
0.57
0.56
0.56
1
0.40
0.50
0.72
1.20
2
0.27
0.37
0.58
1.12
3
0.37
0.46
0.64
1.10
4
0.33
0.54
0.94
1.64
5c
0.31
0.66
1.38
3.94
6c
0.22
0.59
1.33
4.10
7c
0.15
0.44
1.02
3.00
8
0.24
0.61
1.30
1.97
9
0.29
0.54
0.97
1.79
10
0.17
0.54
1.28
2.53
11
0.18
0.45
0.95
1.97
12
0.24
0.46
0.87
2.01
13c
0.21
0.58
1.29
2.68
14
0.09
0.49
1.23
2.38
15
0.22
0.48
0.97
1.80
16
0.37
0.52
0.76
1.61
17
0.34
0.50
0.78
1.05
18
0.38
0.44
0.52
1.03
Average daily
excess rate and standard deviation
0.28 (0.11)
0.51 (0.17)
0.95 (0.28)
1.97 (0.96)
Total excess rate for all lags 5.34 9.73 18.11 37.48

aPer 100,000 persons at 0–18 days lag postexposure at different levels of drinking water turbidity.
bNTU, Nephelometric Turbidity Units.
cLags in bold had statistically significant regression slopes (p <0.05).

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