Variable | Year | Supplement |
---|---|---|
PLNEXCHG2 | 2022 | In both sample adult and child questionnaires |
PLNEXCHG2 | 2021 | In both sample adult and child questionnaires |
PLNEXCHG2 | 2020 | In both sample adult and child questionnaires |
PLNEXCHG2 | 2019 | In both sample adult and child questionnaires |