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Table 1 Demographic characteristics of the study patients

From: Comparison of restrictive fluid therapy with goal-directed fluid therapy for postoperative delirium in patients undergoing spine surgery: a randomized controlled trial

Characteristic

Group RF (n = 97)

Group GDT (n = 98)

P value

Age, med (IQR)

60 (55–68)

58 (56–66)

0.929

Male, n (%)

52 (53.6)

52 (53.1)

0.939

BMI (kg·m−2), mean (SD)

23.54 (3.40)

23.80 (2.75)

0.547

ASA

 I, n (%)

28 (28.9)

30 (30.6)

0.790

 II, n (%)

69 (71.1)

68 (69.4)

0.790

Education, n (%)

 Illiterate, n (%)

30 (30.9)

30 (30.6)

0.718

 1–6 years of education years, n (%)

24 (24.7)

29 (29.5)

0.718

 ≥7 years of education years, n (%)

43 (44.3)

39 (39.7)

0.718

Baseline MMSE, med (IQR)

29 (25–30)

27 (25–30)

0.348

Dependence on smoking, n (%)

19 (19.5)

18 (18.3)

0.828

Alcohol abuse, n (%)

7 (7.2)

11 (11.2)

0.334

Comorbidity, n (%)

 Coronary heart disease, n (%)

7 (7.2)

6 (6.1)

0.759

 Hypertension, n (%)

18 (19.6)

23 (23.4)

0.400

 Diabetes mellitus, n (%)

7 (7.2)

7 (7.1)

0.984

 Hydrothorax, n (%)

8 (8.2)

7 (7.1)

0.772

Type of surgery

 Lumbar spine stenosis surgery, n (%)

69 (71.1)

71 (72.4)

0.838

 Thoracic spinal stenosis surgery, n (%)

28 (28.9)

27 (27.6)

0.838

Number of vertebral levelsc, med (IQR)

2 (2–3)

2 (2–3)

0.797

Preoperative waiting time (d), med (IQR)

6 (5–8)

6 (5–8)

0.418

Preoperative hemoglobin (mg/l), mean (SD)

130.3 (12.8)

131.1 (17.1)

0.710

Preoperative hematocrit (%), med (IQR)

40 (37–42)

40 (37–43)

0.567

Number of patients using NSAIDs, n (%)

11 (11.3)

12 (14.3)

0.538

  1. Med median, IQR interquartile range, SD standard deviation, ASA American Society of Anesthesiologists, BMI body mass index, med median, cLevels were defined as the number of vertebrae involved in the surgery, NASIDs nonsteroidal anti-inflammatory drugs