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. Author manuscript; available in PMC: 2008 Jul 1.
Published in final edited form as: Vision Res. 2007 Jun 29;47(16):2179–2186. doi: 10.1016/j.visres.2007.04.017

Table 2.

Cross-twin correlations stratified by zygosity (95% confidence intervals)

MZ DZ
1.5 cpd .203 (.132, .273) −.040 (−.086, .006)
3 cpd .160 (.018, .295) .020 (−.139, .178)
6 cpd .370 (.241, .486) .141 (−.021, .296)
12 cpd .219 (.080, .351) .027 (−.137, .190)
18 cpd .250 (.113, .377) .077 (−.079, .229)