The experimental groups were as follows: Group 1 = 14 KD with ZH; Group 2 = 14 KD without ZH; Group 3 = 16 KCh with ZH and Group 4 = 16 KCh without ZH.
Los grupos experimentales quedaron como sigue: Grupo 1 = 14 KD sin CZ; Grupo 2 = 14 KD con CZ; Grupo 3 = 16 KCh con CZ y Grupo 4 = 16 KCh sin CZ.