There were no differences in long-term outcome for patients who had or had not been subjected to reoperation (Table 4).Table 4Outcome 2–6 years after primary surgery in iNPH patients who underwent reoperation, compared with patients in whom reoperation was not performed. The outcome measures are self-reported mRS (smRS) and “Improved health condition”, signifying the proportions of patients replying “better” to the following question: “How are you feeling now, compared with your condition before surgery?”Reoperated patients, n (% of available questionnaire responses at specified year)smRS, median (IQR) p Improved health condition, n (%) p Re-op.Not re-op.Re-op.Not re-op.2 years53 (18)2 (1–3)2 (1–3).6126 (53.1)147 (63.1).203 years55 (22)3 (1–3)2 (2–3).1529 (55.8)119 (65.7).204 years39 (26)2 (1–3)2 (2–3).2021 (56.8)73 (69.5).165 years42 (29)2 (2–3)2 (1–3).2118 (52.9)68 (68.7).156 years12 (22)3 (1–5)3 (2–3).787 (53.8)22 (55.0)1.0 Re-op. reoperated