I found a site that have put together a list of some penis-size studies in asia (mostly japan).
The page is all in japanese but I will try to summarize some stuff. URL to the page
All measurements are in centimeters. 1 inch = 2.54 centimeters.
If you need an inch/cm converter you can find one HERE
The first study is from 1933, 45 japanese soldiers were measured:
Average BPEL: 12,7 cm
Average EG: 11,5 cm
Average FL: 8,2 cm
Average FG: 8,5 cm
1981, Fuji Latex, 664 japanese men filled in a questionnaire:
Average BPEL: 13,9 cm
Average EG: 11,9 cm
1994, 46 japanese men were measured by an urologist:
Average BPEL: 11,2 cm
Average EG: 8 cm
Okamoto corp. asked(!) 100 japanese men of the streets of Tokyo about their size:
Average BPEL: 15,1 cm
Strange that the average BPEL was 1-2 cm bigger in this study
A study from 1998 by a korean condom maker:
Average BPEL: 12,6 cm
Average EG (Base): 11,2 cm
1998, 232 korean men were measured by an urologist:
Average BPEL: 11,8 cm
Average EG: 12,1 cm
Average FL: 7,7 cm
Average FG: 9 cm
There are 4 other studies from korean urologists that more or less shows the same result.
Finally a chinese study. 2547 chinese men from beijing were measured at a hospital:
Average BPEL: 13 cm
Average EG: 10,7 cm
Average FL: 7,4 cm
Average FG: 8,2 cm
Longest BPEL: 17.4 cm
Shortest BPEL: 8,6 cm
There are a more studies on the page, but I listed the ones I found the most interesting.
Most studies mention "bone-pressed", but I assume that all studies use bone-pressed measurements.