Table 2.

Intrapair ICC and heritability (from AE model) of RHR

	Pairs	ICC*		Pairs	Heritability†
All ages
MZ	479	0.23 (0.14 to 0.32)	All	1233	0.23 (0.15 to 0.30)
DZ	754	0.10 (0.03 to 0.17)	Male	467	0.27 (0.15 to 0.38)
ssDZ	431	0.07 (0 to 0.16)	Female	443	0.17 (0.06 to 0.28)
osDZ	323	0.14 (0.03 to 0.25)
45–65 year
MZ	370	0.24 (0.14 to 0.34)	All	982	0.24 (0.15 to 0.32)
DZ	612	0.10 (0.02 to 0.18)	Male	374	0.23 (0.11 to 0.36)
ssDZ	324	0.06 (0 to 0.16)	Female	320	0.22 (0.08 to 0.35)
osDZ	288	0.16 (0.04 to 0.27)
>65 year
MZ	109	0.16 (0 to 0.34)	All	251	0.17 (0.01 to 0.33)
DZ	142	0.11 (0 to 0.27)	Male	93	0.42 (0.14 to 0.69)
ssDZ	107	0.12 (0 to 0.30)	Female	123	0.07 (0 to 0.27)
osDZ	35	0.09 (0 to 0.41)

^*ICC of resting heart rate adjusted for sex and age,

^†Heritability from AE model.

DZ, dizygotic; ICC, intraclass correlation; MZ, monozygotic; osDZ, opposite-sex dizygotic; RHR, resting heart rate; ssDZ, same-sex dizygotic.