Volume 13, Number 1—January 2007
Research
Correlation between Subtypes of Cryptosporidium parvum in Humans and Risk
Paul R. Hunter*, Stephen J. Hadfield†, Dawn Wilkinson*, Iain R. Lake*, Florence C.D. Harrison*, and Rachel M. Chalmers†
Table 2
Logistic regression model from case-control study (19) showing final model from original study and recalculated using only those strains with the ML1–242 polymorphism as cases*
| Cases/variable | Cases, n (%) | Controls, n (%) | Odds ratio | 95% CI | p value |
|---|---|---|---|---|---|
| All Cryptosporidium parvum strains | |||||
| Touch or handle any farm animals | |||||
| Yes | 24 (34) | 43 (11) | 2.653 | 1.113–6.323 | 0.028 |
| No | 47 | 348 | |||
| Eat tomatoes | |||||
| Yes | 24 (36) | 249 (50) | 0.317 | 0.140–0.719 | 0.005 |
| No | 43 | 246 | |||
| Eat raw vegetables | |||||
| Yes | 7 (12) | 157 (44) | 0.222 | 0.086–0.572 | 0.001 |
| No | 51 | 196 | |||
| Only ML1–242 strains | |||||
| Touch or handle any farm animals | |||||
| Yes | 21 (43) | 43 (11) | |||
| No | 28 | 348 | 3.810 | 1.444–10.049 | 0.007 |
| Eat tomatoes | |||||
| Yes | 17 (37) | 249 (50) | 0.425 | 0.164–1.104 | 0.079 |
| No | 29 | 246 | |||
| Eat raw vegetables | |||||
| Yes | 4 (10) | 157 (44) | 0.141 | 0.042–0.474 | 0.001 |
| No | 37 | 196 |
*CI, confidence interval. Also included in the models were age and Health Authority of residence.
