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. Author manuscript; available in PMC: 2013 Jun 1.
Published in final edited form as: Learn Individ Differ. 2012 Feb 16;22(3):365–369. doi: 10.1016/j.lindif.2012.01.011

Table 1.

Mean standardized reading performance scores (± SD) of probands, co-twins and co-sibs

MZ DZ Twin/sib
M SD M SD M SD
Proband −2.529 .766 −2.463 .854 −2.525 .811
Co-twin/co-sib −2.324 .973 −1.442 1.336 −1.272 1.391
N pairs 254 420 303