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This reference point will hereafter be referred to as the reference date.
The reference date for WHI is the baseline questionnaire date.
Recency: Current = last use within 6 months before reference date (see methods for definition or reference date); Past = last use > 6 months before reference date.
Age was calculated as of the reference date.
As a result, age at reference date was modeled nonlinearly.
Exposures after the reference date were not considered.
Note: Baseline questionnaire completion is the reference date.
The date of the mammogram was the reference date used for all exposure definitions.
For the cohort with diabetes, the date of diabetes onset was considered the reference date.
The reference date for risk-tested patients was the date of blood draw for the test.
The reference date for controls was set to the date of diagnosis of the matched case.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com