Table 2: Incidence of an artery with the Ca content more than 5 mg/g.

Age group (years) Incidence (%)
< 50 100% (5/5)
50s 33.3% (3/9)
60s 18.2% (2/11)
70s 26.3% (5/19)
80s 46.7% (7/15)
90s 33.3% (1/3)