Number of centenarians and their siblings at different stages of data collection and cleaning.
| Type of records||Centenarians||Number of shorter-lived siblings|
|All initial nonduplicate records for centenarians born in 1880–1895 with names of parents available||7,174||18,277||25,451|
|Centenarians having detailed information on birth and death dates of their parents||6,370||16,757||23,127||172,091|
|Centenarians having detailed information on birth and death dates of their parents and siblings||707||2,127||2,834||21,893|
|Centenarians after data cleaning with confirmed death dates through the linkage to DMF||365||1,209||1,574||10,885|