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The California Teachers Study (CTS) is an observational cohort study. In 1995-1996, 133,477 women volunteered for the CTS and agreed to provide information about their health and lifestyle. CTS researchers have continued to track these participants and have collected the following types of data:

Data Overview

Study Questionnaires


Participants have been asked to complete six self-reported questionnaires, which collected data on various health conditions and risk factors. 


Linkages with the  California Cancer Registry (CCR)  provide detailed data on diagnosed cancer, including who was diagnosed, the type of cancer diagnosed, and relevant details such as stage, grade, date of diagnosis, and tumor subtype.



Linkages with national and state mortality data provide data on which participants have died, the date of death, and the cause of death.

Inpatient Hospitalizations


Linkages with the State of California also provide detailed data on inpatient hospitalizations, including data on discharge diagnoses, surgical procedures, and other coded conditions relevant to that hospitalization. 

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Although biospecimens were not collected from CTS participants at the start of the study, a number of CTS projects have subsequently collected blood, saliva, and other samples.