Twenty-six of the participants were in the FD-group (mean age = 35.8 years) and 37 in the ND-group (mean age = 31.5 years).
Tuttugu-og-sex þátttakendur voru í FD-hópinum (meðalaldur = 3,8 ár) og 37 í ND-hópnum (meðalaldur = 31,5 ár).