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Early anaphylactic reactions according to the type of antivenom administered
| Type of antivenom | Promethazine | Placebo | Total* | P value |
|---|---|---|---|---|
| Instituto Vital Brazil | 6 | 3 | 9 | |
| Instituto Butantan | 6 | 5 | 11 | 0.432 |
| Fundação Ezequiel Dias | 0 | 5 | 5 | |
| Total | 12 | 13 | 25 |
χ2 for heterogeneity=6.06, P=0.432.
