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Reliability of Age of Onset for Marijuana Use Across Multiple Waves of Reports.
| N-Size | Year to Year Comparison | Intraclass Correlation Coefficient (ICC) | Significance |
|---|---|---|---|
| 1992 | |||
| N = 40 | 1992 – 1994 | .721 | .000 |
| N = 37 | 1992 – 1996 | .664 | .000 |
| N = 13 | 1992 – 1998 | .672 | .01 |
| 1994 | |||
| N = 174 | 1994 – 1996 | .814 | .000 |
| N = 89 | 1994 – 1998 | .711 | .000 |
| 1996 | |||
| N = 264 | 1996 – 1998 | .762 | .000 |
