Quality Control Data

As part of the baseline data collection a quality control (QC) survey was conducted to acertain the reproducibility of initial results. The survey involved over 15,000 participants (3.1%) and typically took place within 4-6 weeks of the baseline survey. Data are available for several questionnaire variables (e.g., smoking, alcohol drinking, tea consumption, number of hours slept, certain aspects of reproductive history for women, etc), and for the measurement of blood pressure.

Link to Quality Control Questionnaire