Postoperative health condition in 979 iNPH patients. Percentage of iNPH patients reporting better, unchanged or worse health condition, of whom the following question was asked: “How are you feeling now, compared with your condition before surgery?” after 2–6 years. The 3-month evaluation was carried out in the clinical follow-up setting; results at the 2- to 6-year evaluation come from follow-up questionnaires. The number of available answers at each time point is indicated above the bars