Often in China, a patient pays 0%(teeth extraction as mentioned above, for example), but if we imagined the 50% copay was a hard rule, the important component is cost basis, 30% of what vs. 50% of what.
30% of $200 vs. 50% of $40 for an identical pair of glasses means someone in japan paying 30% is paying $66 white someone in China paying 50% is paying $20, less than a third of the price for the same treatment.
The uninsured cost basis is extremely low in China.