Actually i believe that sg's average has been pulled down by the m&ds and the shit skins. Also take note that this isn't a fair comparison since each country has different population sizes. Look up mudland for eg. Majority malays but the average age is pretty young and so -called fitter at 26 compared to hk's which is at 42.4yrs. Older men tend to have difficulty having a harder erection and hence they were probably not fully erect when their dicks were measured but yet it's still equal to mudland's majority malays.
Next you compared shitland aka india with china. India has like 1 billion ppl while china has even more at 1.3 billion and aren't north indians especially sikhs considered to be bigger than the rest of the kelings? Yet they still have smaller dicks compared to china with a large population.
This in effect shows that chinese have the biggest dicks among the m&ds and shit skins. Too bad the average for sg was pulled down by the kelings if not it would be higher than 4.5