Table 2.

Intraclass Twin Correlations for Intraindividual Means and Standard Deviations of Positive and Negative Affect

	Positive affect		Negative affect
Zygosity group	Intraindividual means	Intraindividual standard deviations	Intraindividual means	Intraindividual standard deviations
Monozygotic twins	.46 [.31, .58]	.35 [.19, .49]	.50 [.32, .63]	.55 [.41, .65]
Dizygotic twins	.37 [.19, .52]	–.02 [–.22, .17]	.17 [.003, .33]	.10 [–.10, .28]

Note: Values in brackets are 95% confidence intervals.