Max Rady College of Medicine

Concept: Return Migration

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Concept Description

Last Updated: 2022-12-08

Introduction

    concept/Social Determinants of Health-SDOH-Digital Library-Image.jpg This concept describes how Return Migration is operationalized for immigration-related research at MCHP. The concept includes the following sections:


    Definition: return migration is a special type of emigration or outmigration in which an international immigrant or interprovincial migrant returns to their place of birth or last permanent residence.

Data Sources

Methods

    In the deliverable. The Diversity of Immigrants to Manitoba, Migration Dynamics and Basic Healthcare Service Use by Urquia et al. (2020), return migration was operationalized as a new registration in the Manitoba Health Insurance Registry after having resided in Manitoba and leaving the province for at least 360 days, based on cancellation of coverage followed by a new registration. We calculated the return migration rate as the percent of people who left Manitoba and subsequently returned after more than 360 days.

    The following describes the basic algorithm in developing the methodology for this concept. It summarizes the SAS® code example that is provided in the SAS code and formats section below.

    1. create the immigrant cohort file from the IRCC crosswalk file for all immigrants found in Manitoba and sort by the unique IRCC identification number (IDNO);
    2. create a landing file containing the arrival and landing dates from the two IRCC legacy and current landing files;
    3. sort the landing file, and then merge with the immigrant cohort file using the unique IRCC identification number (IDNO);
    4. sort the landing file by scrambled PHIN and landing date to identify and retain the earliest landing record per scrambled PHIN;
    5. create a registry_coverage file using the MCHP REGCOV macro with a parameter for gapdays=360. Sort this file by scrambled PHIN, coverage start date and coverage end date;
    6. merge the landing file with the registry_coverage file to identify coverage episodes during or after landing;
    7. re-scan the Registry files to get the coverage added code (COVCODE) values for each episode (these are not retained by the REGCOV macro), and match these to the proper coverage episode by coverage start date;
    8. keep coverage_code (COVCODE) value from second coverage episode, which will be used to resolve a return to Manitoba after a "cannot locate" value appears in the CANCCODE of the first episode during or after landing. The resulting filename is REGCOV;
    9. keep one summary record of coverage episodes per individual scrambled PHIN, categorizing reasons for leaving (in the first episode) and returning (in the second), counting individuals with 2 or more coverage episodes as returned;
    10. of those counted as returned, only count as a true return migration if the cancellation of their first coverage episode during or after landing was either due to leaving the province (to another province, territory or country), or due to a “cannot locate” value followed by a coverage added code in the second episode indicating a new resident from another province, territory or country; ;
    11. keep one record per individual scrambled PHIN, categorizing the reason for leaving and returning;
    12. produce output tables summarizing out/remigration counts by landing year and reason.

Research Findings

Cautions / Limitations

    The following limitations were identified during development of this concept:

    • Those individuals who could not be located have likely moved out of the province, but we do not have the data to determine this. We assume that if a "cannot locate" status code is followed in the next coverage episode by a coverage added code indicating a new resident from another province or territory of Canada, or another country, then the person had indeed left the province and returned.

SAS code and formats 

Related concepts 

Related terms 

References 

  • Urquia M, Walld R, Prior H, Detillieux G, Eze N, Koseva I. The Diversity of Immigrants to Manitoba, Migration Dynamics and Basic Healthcare Service Use. Winnipeg, MB: Manitoba Centre for Health Policy, 2020. [Report] [Summary] [Additional Materials] (View)


Contact us

Manitoba Centre for Health Policy
Community Health Sciences, Max Rady College of Medicine,
Rady Faculty of Health Sciences,
Room 408-727 McDermot Ave.
University of Manitoba
Winnipeg, MB R3E 3P5 Canada

204-789-3819