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In a case-control study of 121 young insulin-dependent diabetics diagnosed as having an episode of hypoglycemia, the relative risk estimate comparing human with animal insulins was 0.8 (95% confidence interval 0.4, 1.6) controlling for age, general practice, and calendar time. We conclude that in this study population derived from general practices in the United Kingdom, the risk of hypoglycemia was no higher in users of human insulin than it was in users of animal insulins.
Jick et al. (1990) studied this question.