Table 5.

Preoperative characteristics of patients with and without improved secondary outcomes a year after surgery

Characteristic	iNPHGS total			iNPHGS gait			iNPHGS cognitive			iNPHGS urinary
	Improvement (n = 29)	No improvement (n = 18)	p value	Improvement (n = 24)	No improvement (n = 23)	p value	Improvement (n = 20)	No improvement (n = 27)	p value	Improvement (n = 14)	No improvement (n = 33)	p value
Demographic information
Age (years)	67.0 ± 8.8	66.8 ± 9.9	0.958	66.5 ± 9.5	67.2 ± 9.0	0.854	66.7 ± 8.9	67.1 ± 9.4	0.919	65.1 ± 8.1	67.6 ± 9.5	0.552
Duration of symptoms	12 (6–24)	12 (5–62)	0.807	12 (6–33)	12 (5–48)	0.765	12 (6–20)	15 (7–60)	0.301	6 (3–24)	12 (11–51)	0.357
Preoperative clinical outcomes
mRS score	2.0 (2.0–4.0)	2.0 (1.8–3.0)	< 1.0	2.0 (1.0–3.3)	2.0 (2.0–3.0)	0.428	2.0 (2.0–4.0)	2.0 (1.3–3.0)	0.598	2.0 (1.0–4.0)	2.0 (2.0–3.0)	0.976
iNPHGS score	6.0 (5.0–8.0)	5.5 (3.0–7.0)	0.311	6.5 (4.8–7.3)	6.0 (3.0–7.0)	0.605	6.0 (5.0–8.5)	6.0 (3.3–7.0)	0.419	7.0 (6.0–8.0)	5.0 (3.0–7.0)	0.11
MRI findings
DESH score	6.0 (5.0–6.0)	4.0 (3.0–6.3)	0.238	6.0 (4.0–6.3)	5.0 (4.0–6.0)	0.461	6.0 (4.5–6.0)	5.0 (3.3–6.0)	0.388	6.0 (5.0–6.0)	5.5 (4.0–6.0)	0.657
iNPH Radscale	8.0 (8.0–10.0)	7.5 (5.8–10.0)	0.397	8.0 (7.5–10)	8.0 (6.0–10.0)	0.643	8.0 (7.0–9.0)	8.0 (6.3–10.0)	0.803	9.0 (8.0–10.0)	8.0 (6.0–10.0)	0.244
EI	0.37 (0.33–0.41)	0.36 (0.32–0.41)	0.756	0.36 (0.34–0.41)	0.36 (0.32–0.41)	0.978	0.37 (0.34–0.43)	0.36 (0.32–0.41)	0.677	0.34 (0.32–0.45)	0.37 (0.33–0.40)	0.657
CA	83.0 (75.0–93.0)	91.0 (78.5–104.0)	0.177	83.5 (73.3–93.3)	86.0 (79.0–97.0)	0.285	84.0 (79.0–89.5)	85.5 (72.0–96.8)	0.677	84.0 (75.0–96.0)	85.0 (74.3–95.3)	0.79

Nonparametric data are presented as median (interquartile range). Significant difference was determined using the Mann-Whitney U test

iNPHGS idiopathic normal pressure hydrocephalus grading scale, MRI magnetic resonance imaging, mRS modified Rankin Scale, DESH disproportionately enlarged subarachnoid space hydrocephalus, EI Evans’ index, CA callosal angle