. Author manuscript; available in PMC: 2019 Jul 1.

Published in final edited form as: Behav Genet. 2018 Apr 20;48(4):298–314. doi: 10.1007/s10519-018-9900-8

Table II.

Sample Size by Zygosity and Time Point

Year	Teacher Ratings		Parent Ratings
Year	MZ	DZ	MZ	DZ
Year 7	153	137	167	143
Year 8	153	131	--	--
Year 9	142	113	170	147
Year 10	140	114	173	145
Year 11	143	117	174	146
Year 12	134	117	158	134
Year 13	142	107	155	131
Year 14	140	112	124	120
Year 15	117	96	126	122
Year 16	--	--	173	154

Note. Number of twins per time point per rater and zygosity. Ns did not vary between internalizing and externalizing scales within raters. Overall teacher N = 216 MZ and 192 DZ; overall parent N = 231 MZ and 201 DZ.