RESULTS	Compared to the diclofenac plus omeprazole group , the average total direct cost per patient in the celecoxib group showed a significant reduction of 11 % , from HK 10,915 ( range HK dollars 10,915-57 ,899 ) to HK dollars 9714 ( range HK dollars 9714-89 ,770 ) ( P < 0.0001 ) ( 1 US dollars = 7.8 HK dollars ) .\