... article as: Zubillaga et al., A cohort study of accidents occurring in mentally handicapped patients living in institutions Annals of General Psychiatry 2010, 9:22 Page of ... strategies Methods Study design An observational, analytical, longitudinal, prospective, repeated measures study involving accidents occurring in six institutions in the north of Spain, all of which belong ... 1.8 in the centres studied, are of interest This latter finding is difficult to explain in centres that, at least nominally, have similar characteristics in terms of numbers of staff and patients...