Table 2.

Characteristics of HDs included in this study

ID	Sex	Age, y	ID	Sex	Age, y
1	?	59	21	Male	72
2	Female	77	22	Female	71
3	Male	68	23	Male	70
4	Male	64	24	Female	71
5	Female	65	25	Male	65
6	Male	65	26	Female	66
7	Male	63	27	Male	66
8	Male	65	28	Female	63
9	Male	67	29	Male	70
10	Female	65	30	Male	66
11	Male	64	31	Female	65
12	Male	71	32	Female	67
13	Male	69	33	Female	70
14	Male	66	34	Female	69
15	Male	65	35	Female	61
16	Male	67	36	Female	63
17	Male	64	37	Female	66
18	Male	68	38	?	64
19	Male	63	39	?	64
20	Male	66

?, unknown; ID, identifier.