Microplastics found in every human testicle in study

Scientists say discovery may be linked to decades-long decline in sperm counts in men around the world

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(In a study of ~20 people)
- With 23 of 23 samples, that’s a 78-100% 99% confidence interval (using an adjusted Wald method, which is good for small samples), so the sample size isn’t really an issue. The representativeness of the sample might be a concern, but for whatever the sample generalizes to, this is a high rate.

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