A significantly lower incidence of POST was observed in Strefen and Siccoral groups at 0 and 1 h compared to Control group ( Strefen : P = 0.004 10 ( -2 ) , P = 0.007 10 ( -4 ) ; Siccoral : P = 0.003 10 ( -8 ) , P = 0.007 10 ( -5 ) , respectively ) .