The necessity of gait evaluation on the 7th day after tap tests for the idiopathic normal pressure hydrocephalus patients

Table 1 Background characteristics of the probable iNPH patients who underwent tap tests

Variable	Overall (n=108)	1st or 3rd day^a (n = 85)	7th day^b (n = 23)	p value
Demography
Age, median (IQR)	79.5 (76–83)	79 (76–83)	81 (77−83.5)	0.51
Male, n (%)	59 (54.6)	48 (56.5)	11 (47.8)	0.49
iNPH grading scale
Gait (0–4), median (IQR)	2 (1–3)	2 (1–3)	2 (1.5−3)	0.75
Cognition (0–4), median (IQR)	2 (1–3)	2 (1–3)	3 (1.5−3)	0.24
Urinary (0–4), median (IQR)	2 (1–2)	2 (1–2)	2 (1.0–3)	0.38
Pre-tap test TUG, sec. (IQR)	21.1 (14.7–40.4)	21.5 (14.7–40.0)	20.5 (14.6–36.0)	0.85
Pre-tap test MMSE (IQR)	23 (19–27)	23 (19–27)	21 (18–24)	0.044
Image findings
Evans’ index, median (IQR)	0.33 (0.32–0.35)	0.33 (0.32–0.35)	0.33 (0.32–0.35)	0.85
Callosal angle, median (IQR)	84.7 (71.4–98.8)	88.0 (71.4−102.7)	80.9 (66.0−91.6)	0.17
Size of TH, median (IQR)	5.35 (4.18–6.85)	4.88 (3.68–7.15)	5.2 (4.25–6.40)	0.96
DESH, n (%)	84 (77.8)	66 (77.6)	18 (78.3)	0.95

Abbreviations: IQR Interquartile range, iNPH Idiopathic normal pressure hydrocephalus, TUG Timed Up Go test, MMSE Mini-Mental State Examination, TH Temporal horn, DESH Disproportionately enlarged subarachnoid space
p value less than 0.05 in the univariate analysis is considered significant
^aThe group of patients who showed gait improvement either of the 1st or 3rd day after tap tests
^bThe group of patients who showed gait improvement for the first time on the 7th day after tap tests

ISSN: 1471-2318