3 Results

3.6 Circumference of penis during sleep: grouped by response

Figure 9 shows the distribution of sleep erections (NPT), measured in study 3 (N=39). Table 7 shows the frequency distribution for subjects in this study with a circumference change of more than 10 mm (n=25). For this group the mean circumference was 116 mm (standard deviation 10 mm, range 90 - 135 mm, median 116 mm). Twenty-five percent of these subjects obtained a penile circumference of less than 109 mm, seventy-five percent obtained a penile circumference of less than 125 mm, and ninety percent obtained a penile circumference of less than 128 mm.

Figure 9. Distribution of circumferences (in mm) of the erect penis, measured during sleep. Circumferences are grouped by response (N= 39).

Table 7. Frequency distribution of nocturnal penile circumference , subjects with circumference change > 10 mm only (N=25)