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Table 1 Demographic characteristics of the patients

From: Comparison of the operative time for open door laminoplasty using titanium plate spacers or hydroxyapatite block spacers: a retrospective study

Variables

TP group

(n = 62)

HA group

(n = 102)

p value

Sex, male, n (%)

47 (76)

83 (81)

0.39

Age, mean (SD), years

70 (8.0)

68 (9.3)

0.06

BMI, mean (SD), kg/m2

24 (3.7)

23 (3.4)

0.60

ASA physical status (≥ 3), n (%)

9 (15)

19 (19)

0.50

OPLL, n (%)

17 (27)

27 (26)

0.89

Diabetes mellitus, n (%)

23 (37)

13 (13)

< 0.001

Antiplatelet or anticoagulant medicine, n (%)

6 (9.7)

13 (13)

0.55

Level of operator (consultant), n (%)

17 (27)

51(51)

0.003

Timing of operation (day time), n (%)

34 (55)

58 (57)

0.80

Number of DL, mean (SD)

4.3 (0.60)

4.0 (0.64)

0.03

Preoperative diameter of cervical canal, mean (SD), mm

12 (1.2)

12 (1.7)

0.11

Laminoplasty of dens, n (%)

13 (21)

37 (36)

0.04

Hemoglobin, mean (SD), g/dl

13 (2.0)

14 (1.7)

0.42

Platelet, mean (SD), 104/μl

21 (7.0)

21 (17)

0.99

eGFR, mean (SD), ml/min/1.73 m2

69 (25)

71 (20)

0.51

PT-INR, mean (SD)

0.98 (0.13)

1.1 (0.20)

0.01

APTT, mean (SD), s

29 (5.5)

27 (4.2)

0.07

  1. Abbreviations: TP titanium plate, HA hydroxyapatite block, SD standard deviation, BMI body mass index, ASA American Society of Anestheologists, OPLL ossification of posterior longitudinal ligament, DL decompressed lamina, eGFR estimated glomerular filtration rate, PT-INR prothrombin time-international normalized ratio, APTT activated partial thromboplastin time