Variable | Year | Supplement |
---|---|---|
OPXCHNG | 2022 | In both sample adult and child questionnaires |
OPXCHNG | 2021 | In both sample adult and child questionnaires |
OPXCHNG | 2020 | In both sample adult and child questionnaires |
OPXCHNG | 2019 | In both sample adult and child questionnaires |
OPXCHNG | 2018 | Person (core questionnaire) |
OPXCHNG | 2017 | Person (core questionnaire) |
OPXCHNG | 2016 | Person (core questionnaire) |
OPXCHNG | 2015 | Person (core questionnaire) |
OPXCHNG | 2014 | Person (core questionnaire) |