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. Author manuscript; available in PMC: 2010 Jul 1.
Published in final edited form as: Dev Sci. 2009 Jul;12(4):626–633. doi: 10.1111/j.1467-7687.2008.00801.x

Table 1.

Means (and Standard Deviations) for Measures of AL by Sex and Zygosity

Males Females Effect Sizea
AL Measure MZ DZ MZ DZ Sex Zygosity
Home
 Actigraph 21.63 (2.49) 21.21 (2.45) 20.79 (2.45) 20.85 (2.10) .24 .07
 TBAQ 44.42 (9.01) 42.56 (9.41) 39.04 (6.98) 40.54 (8.01) .41 .01
Lab
 Actigraph 26.97 (5.53) 27.17 (5.02) 24.74 (5.02) 24.54 (4.83) .47 .02
 IBR 0.18 (0.81) 0.23 (0.81) -0.20 (0.77) -0.24 (0.71) .53 .01

Note. MZ=monozygotic twins, DZ=dzygotic twins.

a

Cohen's d.