The Swedish study showed an AS prevalence of about 1/20,000 and the Danish study showed a minimum AS prevalence of about 1/10,000.
أظهرت الدراسة السويدية انتشار AS حوالي 1/20000 وأظهرت الدراسة الدنماركية AS انتشار حوالي 1/10000 كحد أدنى.