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Cross-twin and cross-twin cross-trait correlations for all main study variables
| Zygosity | Onset of regular cannabis use | Insomnia | Insomnia with short sleep on weekdays (<6 h) | Onset and insomnia | Onset and insomnia with short sleep on weekdays (<6 h) |
|---|---|---|---|---|---|
| MZ | 0.74* (p < 0.001) | 0.46* (p < 0.001) | 0.39* (p < 0.001) | 0.11 (p = 0.102) | 0.13* (p = 0.019) |
| DZ | 0.49* (p < 0.001) | 0.16 (p = 0.086) | 0.15 (p = 0.134) | 0.07 (p = 0.227) | 0.06 (p = 0.220) |
MZ = monozygotic; DZ = dizygotic.
* p < 0.05.
