PSI index at the level of the OAA / S through titration times Level O AA / S Group I SDX Group II SDX p 13 1 54, 44 ± 6, 64 n= 34 53, 28 ± 5, 01 n= 64 < 0, 05 2 63, 22 ± 3, 37 n= 98 61, 91 ± 4, 20 n= 227 < 0, 01 3 75, 28 ± 3, 08 n= 144 74, 34 ± 3, 27 n=2 < 0, 01 4 84, 07 ± 3, 08 n= 237 81, 74 ± 3, 13 n= 130 < 0, 01 5 92, 97 ± 3, 75 n= 358 90, 76 ± 4, 84 n= 68 < 0, 01 3.3.5.