Table 1 Outcomes and covariates, period of ascertainment, and data sources
Variable | Period of ascertainment | Data sources |
|---|---|---|
Primary outcome | ||
 Most recent HbA1c 12 months after the final pediatric visit | 12 months after the final pediatric visit | Ontario Lab Information System (OLIS) |
Secondary outcomes | ||
 At least one diabetes-related admission | 12 months after the final pediatric visit | Hospital Discharge Abstract Database (DAD) |
 At least one diabetes-related emergency department visit | National Ambulatory Care Reporting System (NACRS) | |
 Death | Registered Persons Database (RPDB) and the Ontario Registrar General-Death (ORGD) | |
 Gap in time (months) from the final pediatric visit to first adult diabetes visit | Medical record (date of final pediatric visit) and OHIP and ICES physician database (date of the first adult diabetes visit) | |
Covariates | ||
 Sex | At the time of the final pediatric visit | Medical record |
 Duration of diabetes | Medical record (date of diabetes diagnosis) | |
 Rurality | Postal code ascertained from the medical record and the Rurality Index for Ontario | |
 Socioeconomic status (deprivation quintile) | Postal codes ascertained from the medical record and 2006 Canadian Census to assign neighbourhood material deprivation quintiles | |
 Most recent HbA1c at the time of the final pediatric visit | 24 months prior to the final pediatric visit | Medical record |
 Any diabetes-related admission | Hospital Discharge Abstract Database (DAD) | |
 Any diabetes-related emergency department visit | National Ambulatory Care Reporting System (NACRS) | |
 Any mental health visit | Ontario Mental Health Reporting System and OHIP | |