Table 1 Baseline characteristics of shunted patients who were included and excluded from data analysis

Age, years

76.0 (73.0–80.0)

72.0 (71.0–76.5)

0.02^a

75.4 ± 6.2

72.8 ± 7.8

NS^a

Sex, m/f (m %)

51/44 (57.9)

11/10 (52.4)

NS^b

62/54 (53.4)

29/14 (67.4)

NS^b

Hypertension, n (%)

60 (63.2)

8 (38.1)

0.04^b

68 (58.6)

22 (51.2)

NS^b

Diabetes, n (%)

24 (25.3)

8 (38.1)

NS^b

32 (27.6)

13 (30.2)

NS^b

Ischemic heart disease, n (%)

24 (25.3)

4 (19.1)

NS^b

28 (24.1)

7 (26.3)

NS^b

Stroke, n (%)

5 (5.3)

6 (28.6)

 < 0.01^b

11 (9.5)

4 (9.3)

NS^b

MMSE-SR, Scores (0–30)

26.0 (22.8–28.0) n = 94

25.0 (23.0–28.0)

NS^a

26.0 (23.0–28.0) n = 115

27.0 (23.0–28.0) n = 37

NS^a

Total iNPH scale score preop (0–100)

53.5 ± 15.7

44.0 ± 20.0

0.02^c

51.8 ± 16.9

55.7 ± 17.5 n = 34

NS^c

Volume drained at CSF TT (ml)

48.0 (44.0–50.0) n = 88

50.0 (45.0–50.0) n = 15

NS^a

48.0 (44.0–50.0) n = 103

47.5 (41.8–50.0) n = 20

NS^a

Opening Pressure CSF TT (cmH2O)

15.0 (12.0–18.0)

17.8 (15.5–23.0) n = 14

0.01^a

15.0 (12.5–18.0) n = 109

18.0 (15.0–22.0) n = 23

0.01^a

Duration baseline to surgery, (days)

120.0 (99.0–157.0)

135.0 (116.0–177.0)

NS^a

126.0 (102.3–159.0)

133.0 (100.5–171.8) n = 34

NS^a

Duration surgery to follow-up, (days)

107.0 (90.0–131.0)

97.0 (87.0–120.5)

NS^a

104.0 (90.0–127.5)

108.0 (93.3–191.8) n = 26

NS^a

Shunt adjustment before follow-up, n (%)

16 (16.8)

2 (9.5)

NS^b

18 (15.5)

10 (24.4) n = 41

NS^b

Shunt revision before follow-up, n (%)

8 (8.4)

3 (14.3)

NS^b

11 (9.5)

13 (31.7) n = 41

 < 0.01^b