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*
, Andrey I. Egorov*, Robert D. Morris*, and Jeffrey K. Griffiths*
, Andrey I. Egorov*, Robert D. Morris*, and Jeffrey K. Griffiths*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).
