Prevalence estimates of suicidal ideation, planning and repetition and phi correlation with marijuana use among senior high school students in Ghana, WHO GSHS, 201215
| Suicidal domain | Prevalence (95% CI) | φ with marijuana use |
| Suicidal ideation | 18.9 (16.8 to 21.2) | 0.11*** |
| Suicidal planning | 23.1 (19.2 to 27.5) | 0.10*** |
| Repeated attempted suicide | 11.5 (9.1 to 14.4) | 0.23*** |
φ phi correlation used to measure the strength of a relationship between two dummy artificial variables; p value indication: ***p<0.001.
GSHS, Global School-Based Student Health Survey.