2.3 Definition of ED and osteoporosis
The diagnosis of ED was based on the response of “Never Able” or
“Sometimes Able” to the question “Ability to get and keep an erection
for satisfactory intercourse,” in unified standard questionnaire or the
use of ED medication. In the progress of analysis, ”Never Able” was
defined as ED and ”Sometimes Able” was defined as non-ED. Bone mineral
density (BMD) of the root bone was measured using a clinical ultrasound
bone densitometer (Sahara Clinical Bone Sonometer, 35 Crosby Drive,
Bedford, Hologic, Inc, USA) according to the standard protocol.
According to the WHO diagnostic criteria, osteoporosis was defined as a
BMD of 2.5 standard deviations or more below the mean value for young
adults (T score ≤−2.5)[19].