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Study population

NS Nina Sundström
JR Johanna Rydja
JV Johan Virhammar
LK Lena Kollén
FL Fredrik Lundin
MT Mats Tullberg
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In this study, 1300 patients were included. Inclusion criteria were diagnosis of iNPH according to international criteria [22] and registered performance on the TUG test both pre- and post-operatively. In total, 51 patients (22/29 women/men, age 76.4 (6.0) years) performed more than 80 s or steps in TUG (median TUGtime + 4 × interquartile range). To avoid the potentially large influence of these subjects which were considered as outliers, on statistical analyses of the main group, they were excluded from the main analyses and instead described as an entity on its own. The selection/division process is shown in Fig. 1. The main group thus consisted of 1249 patients with a mean (SD) age of 74.7 (6.0) years (505 females (40.5%), 74.8 (6.1) years, and 744 males, 74.7 (6.0) years).

Study flow chart

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