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. Author manuscript; available in PMC: 2015 Oct 1.
Published in final edited form as: Dev Psychol. 2014 Aug 25;50(10):2343–2352. doi: 10.1037/a0037693

Table 2.

Descriptive Statistics for Primary Variables

units n Minimum Maximum Mean SD t
6-month Observed Anger z−score 566 −1.82 2.07 0.02 0.62 −0.40
12-month Observed Anger z−score 881 −1.98 1.45 0.01 0.57 0.57
36-month Behavior Problems raw score 219 0.00 0.75 0.23 0.16 0.92
Life Stress raw score 455 0.00 29.00 9.66 5.93 −0.13

Note: t is the product of a t−test comparison of twins