Adolescent sexual behaviour and academic performance of Italian students

Genus

Journal of Population Sciences

Table 8 Sexual activity and mark at high school—all students

	IV—sexual abstinence		IV—early age at first intercourse
	M1	M2	M1	M2
	Second stage
IV coeff	− 3.083*	2.011***	0.699	− 1.195***
IV SE	(1.774)	(0.500)	(0.920)	(0.266)
	First stage
Having had sex without
emotional involvement	− 0.083***	− 0.083***	0.115***	0.115***
	(0.016)	(0.016)	(0.020)	(0.020)
Having cheated the partner	− 0.047***	− 0.047***	0.082***	0.082***
	(0.018)	(0.018)	(0.026)	(0.026)
Having had sex with someone without being in relationship with and without using the condom	− 0.052***	− 0.052***	0.042**	0.042**
	(0.016)	(0.016)	(0.019)	(0.019)
	Tests
F test of excluded instruments:	37.65	25.88	67.99	45.58
Hansen J statistic:	2.33 (p >0.1)	7.59 (p >0.1)	11.33 (p <0.05)	8.44 (p >0.1)
Observations	12,443	12,443	12,443	12,443

Significance levels as follows: *** p <0.01, ** p <0.05, * p <0.1. M1: interaction with mark at low-secondary school; M2: interaction with leisure activities