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. Author manuscript; available in PMC: 2017 Apr 14.
Published in final edited form as: Behav Genet. 2015 Oct 14;46:114–123. doi: 10.1007/s10519-015-9758-y

Table 2.

Number of twin pairs

Age SRH ACT COMP
Group Men Women Men Women Men Women
<50
 MZ 525 674 303 359 316 361
 DZ 584 648 329 340 332 350
50-59
 MZ 778 548 590 237 587 234
 DZ 858 801 517 256 516 258
60-69
 MZ 380 464 202 247 201 248
 DZ 549 706 209 223 212 222
70+
 MZ 248 390 251 394 246 393
 DZ 315 597 319 593 316 581
TOTAL 9065 5373 5369