Volume 14, Number 10—October 2008
Dispatch
Spinach-associated Escherichia coli O157:H7 Outbreak, Utah and New Mexico, 2006
Table 2
Bivariate analysis of statistically significant spinach-related exposures during 8–10 d before onset, Escherichia coli O157:H7 spinach-associated outbreak, Utah and New Mexico, 2006*
Variable | Case-patients | Controls | Matched OR | 95% CI | p value |
---|---|---|---|---|---|
Ate any spinach | |||||
Yes | 18 | 15 | 16.5 | 2.4–710.2 | 0.0005 |
No |
3 |
28 |
1.0 |
||
Ate bagged spinach | |||||
Yes | 17 | 8 | 18.7 | 2.8–797.1 | 0.0001 |
Other type of spinach | 1 | 2 | 10.1 | 0.1–988.8 | 0.41 |
No spinach |
3 |
28 |
1.0 |
||
No. of times ate spinach | |||||
>2 | 8 | 2 | † | 3.6–∞ | 0.0004 |
1–2 | 7 | 9 | 7.4 | 0.8–354.7 | 0.08 |
0 |
3 |
28 |
1.0 |
||
Rewashed spinach | |||||
Yes | 5 | 4 | 1.0 | 0.08–13.8 | 1.0 |
No |
9 |
6 |
1.0 |
||
Location where spinach eaten‡ | |||||
Restaurant | 0 | 6 | |||
Private home |
16 |
10 |
|||
Brand | |||||
Ate only brand A | 7 | 1 | |||
Ate only brand B | 0 | 2 |
*OR, odds ratio; CI, confidence interval.
†Unable to calculate a maximum likelihood estimate for a matched OR.
‡Certain persons reported having eaten spinach both at home and in restaurants.
1Current affiliation: Agency for Toxic Substances and Disease Registry, Atlanta, Georgia, USA.
2Current affiliation: University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA.;