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Table 1 Comparison of patient characteristics in abnormal and normal groups

From: The association of rod curvature with postoperative outcomes in patients undergoing posterior lumbar interbody fusion for spinal stenosis: a retrospective case–control study

Variables

Total

(n = 97)

Abnormal

(n = 44)

Normal

(n = 53)

P

Statistic

Age, Mean ± SD

55.98 ± 11.79

59.91 ± 9.78

52.72 ± 12.39

0.002

1586.5

Gender, n (%)

   

1

0

 Male

51 (52.58)

23 (52.27)

28 (52.83)

  

 Female

46 (47.42)

21 (47.73)

25 (47.17)

  

Height, Mean ± SD

1.66 ± 0.08

1.67 ± 0.07

1.66 ± 0.09

0.766

1207.5

Weight, Mean ± SD

68.41 ± 12.08

66.98 ± 10.06

69.59 ± 13.52

0.278

-1.092

BMI, Mean ± SD

24.58 ± 3.22

23.99 ± 2.77

25.07 ± 3.49

0.093

-1.697

Number of Fused Levels, n (%)

   

0.391

Fisher

 1

54 (55.67)

21 (47.73)

33 (62.26)

  

 2

35 (36.08)

20 (45.45)

15 (28.3)

  

 3

5 (5.15)

2 (4.55)

3 (5.66)

  

 4

2 (2.06)

1 (2.27)

1 (1.89)

  

 5

1 (1.03)

0 (0.00)

1 (1.89)

  

Surgical Time, Mean ± SD

2.73 ± 0.77

2.89 ± 0.87

2.59 ± 0.66

0.068

1412.5

Blood Loss, Mean ± SD

377.84 ± 276.60

419.32 ± 275.18

343.40 ± 275.62

0.033

1453

Hospital Stay, Mean ± SD

7.53 ± 2.85

7.52 ± 2.92

7.53 ± 2.83

0.994

1167.5

LL, Mean ± SD

49.01 ± 11.5

47.06 ± 12.77

50.63 ± 10.16

0.138

-1.498

PT, Mean ± SD

15.2 ± 7.4

15.02 ± 7

15.36 ± 7.78

0.82

-0.228

PI, Mean ± SD

50.23 ± 10.3

49.82 ± 10.28

50.58 ± 10.41

0.721

-0.358

SS, Mean ± SD

35.03 ± 8.15

34.80 ± 9.31

35.22 ± 7.13

0.81

-0.241

PI-LL, Mean ± SD

1.22 ± 10.21

2.76 ± 10.61

-0.05 ± 9.79

0.182

1.344

PI-LL, n (%)

   

0.719

0.129

  > 10

28 (28.87)

14 (31.82)

14 (26.42)

  

  ≤ 10

69 (71.13)

30 (68.18)

39 (73.58)

  

Cobb, Mean ± SD

27.87 ± 17.32

29.51 ± 21.63

26.52 ± 12.76

0.791

1203

RC, Mean ± SD

16.90 ± 9.72

10.71 ± 7.98

22.04 ± 7.90

 < 0.001

-6.991

PTA, Mean ± SD

22.39 ± 13.18

22.94 ± 14.14

21.94 ± 12.44

0.948

1175.5

RC-PTA, Mean ± SD

-5.49 ± 12.29

-12.23 ± 11.22

0.10 ± 10.21

 < 0.001

465

  1. aThe difference between two groups were tested by Kruskal–Wallis rank sum test as the distribution of the variable didn’t fully conform to normal distribution
  2. Abbreviation: LL Lumbar lordosis, PT Pelvic tilt, PI Pelvic incidence, SS Sacral slope, PI-LL The difference between PI and LL, Cobb Cobb angle of fused segments, RC Rod curvature, PTA Posterior tangent angle of fused segments, RC-PTA RC minus PTA