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Percentage who reported their age of onset accurately and the variability of inaccuracy across waves of data collection for marijuana use.
| Reported Age of Onset Exactly the Same Wave to Wave | Years of Interviews | ± 1 YEAR | Backward Telescopers ≤ 2 YEARS | Forward Telescopers ≥ 2 YEARS |
|---|---|---|---|---|
| 40.0% | 1992-94 | 70.0% | 20.0% | 10.0% |
| 35.1% | 1994-96 | 74.2% | 5.8% | 20.0% |
| 34.8% | 1996-98 | 72.3% | 8.0% | 19.8% |
