Journal of Population Sciences
Table 4 Sexual activity and mark at high school—all students
From: Adolescent sexual behaviour and academic performance of Italian students
| Â | IV | |
|---|---|---|
| Â | Sexual abstinence | Early age at first intercourse |
| Â | Second stage | |
IV coeff | 1.966*** | − 1.388*** |
IV SE | (0.449) | (0.310) |
| Â | First stage | |
Having had sex without emotional involvement | − 0.083*** | 0.115*** |
| Â | (0.016) | (0.020) |
Having cheated the partner | − 0.047*** | 0.082*** |
| Â | (0.018) | (0.026) |
Having had sex with someone without being | ||
in relationship with and without using the condom | − 0.052*** | 0.042** |
| Â | (0.016) | (0.019) |
| Â | Tests | |
F test of excluded instruments | 25.60 | 45.95 |
Hansen J statistic | 1.95 (p >0.1) | 4.73 (p >0.1) |
Observations | 12,443 | 12,443 |