Table 1: Comparison of gender and mean age distribution in participants attending the Athens, OH, CHIP classes versus those who attended CHIP classes in the US, excluding those attending the Athens classes (Rankin et al. [8]).

CharacteristicsAthensRankin

Total2255,066
 Male631,694
 Female1623,372
 % male2833
 % female7267
Age: mean (range)56.0 (24–81)52.7 (44–71)