Research documents

Data collection

Three samples (or cohorts) of participants currently feed the Lc65+ database : 

• a sample labeled C1 recruited during 2004
• a sample labeled C2 recruited during 2009
• a sample labeled C3 recruited during 2014

New data are collected by mailed questionnaires every year, and through interviews and examinations every three years. 

The Lc65+ database is made up of independent Stata® files, each containing data from one type of questionnaire (postal, interview or examination) for a particular year of collection and sample. Each observation is defined by a unique identifier and the year of data collection. 

The files making up the Lc65+ database are named according to a rule based on sample number, questionnaire type and a sequential number. 

Data dictionary  

Download the data dictionary

An MS Excel® file provides an index of the variables recorded in the study. It contains information on the data collected, as well as the organizational rules for the Lc65+ database (file naming, variable naming, definition of participation status, information on initial sampling, instructions for extraction requests, etc.). To consult this dictionary of variables, click on the button above. The file is read-only (no password required). 

The following table lists the files available for each year of the study and gives access to the content of the questionnaires from which they were generated. In these documents, each question is accompanied by its corresponding variable name in the Lc65+ database. 

To facilitate and standardize the production of certain scores, the dictionary of variables also includes derived variables whose names begin with the prefix "d_", integrated into the Lc65+ database, and whose construction algorithm can be downloaded here.  

C1 cohort - Interview and examination questionnaires

C2 cohort - Interview and examination questionnaires

C3 cohort - Interview and examination questionnaires