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of bias based on political agenda sometimes accompany scientific criticism.
* Correlation does not imply causation. While correlation can be objectively measured, causation is statistically inferred. For example, some suggest that childhood stress is caused by precocious puberty recognized later, rather than being the cause of it.

Changes in time of average age

There were few systematic studies of timing of menarche before the second half of the 20th century.

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