The PCS and MCS of caregivers were slightly worse than that of the Spanish population. Multiple regression analysis showed that: (1) lower PCS was associated with younger age and higher ZBI of the caregiver (R2=0.15); (2) lower MCS was associated with higher ZBI and lower FSS of the caregiver, and lower MCS of the patient (R2=0.29); (3) higher ZBI was associated with lower FSS, PCS and MCS of the caregiver, and to older age and lower PCS and MCS of the patient (R2=0.49). Of caregivers 28.3% had a MCS < or = 42; logistic regression analysis showed that a MCS < or = 42 was associated to higher ZBI and lower FSS scores (p