- More than occasional falls, i.e. daily falls (corresponding to a score greater than or equal to 3 and more in UPDRS item 13), history of fall(s) with significant injuries, absence of postural response in the on condition and/or spontaneous loss of balance in the off condition (corresponding to a score of greater than or equal to 2 and greater than or equal to 3 in on/off condition, respectively, in UPDRS item 30)