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Table 4 Patient characteristics by type of stimulator and sex

From: Sex-specific differences in the efficacy of traditional low frequency versus high frequency spinal cord stimulation for chronic pain

 

Female

 

Male

 

HF-SCS

LF-SCS

p-val

HF-SCS

LF-SCS

p-val

n

40

73

 

54

70

 

Age (mean (SD))

65.03 (12.60)

53.70 (14.98)

< 0.001

58.06 (15.17)

54.46 (15.21)

0.193

Ethnicity (%)

  

0.62

  

0.031

 African American

0 (0.0)

1 (1.4)

 

0 (0.0)

1 (1.4)

 

 Caucasian

2 (5.0)

5 (6.8)

 

1 (1.9)

12 (17.1)

 

 Hispanic

1 (2.5)

1 (1.4)

 

8 (14.8)

4 (5.7)

 

 Non-Hispanic

37 (92.5)

63 (86.3)

 

42 (77.8)

48 (68.6)

 

 Unknown (Patient cannot or refuses to declare ethnicity)

0 (0.0)

3 (4.1)

 

3 (5.6)

5 (7.1)

 

Marriage Status (%)

  

0.73

  

0.79

 Married

24 (60.0)

42 (57.5)

 

36 (66.7)

47 (67.1)

 

 Other/Unknown

0 (0.0)

0 (0.0)

 

1 (1.9)

2 (2.9)

 

 Separated/Divorced

8 (20.0)

14 (19.2)

 

5 (9.3)

5 (7.1)

 

 Single

5 (12.5)

14 (19.2)

 

11 (20.4)

16 (22.9)

 

 Widowed

3 (7.5)

3 (4.1)

 

1 (1.9)

0 (0.0)

 

Insurance Type (%)

  

0.07

  

0.018

 Medicare

15 (37.5)

12 (16.4)

 

15 (27.8)

11 (15.7)

 

 None/Unknown

19 (47.5)

39 (53.4)

 

30 (55.6)

45 (64.3)

 

 Other Government

1 (2.5)

1 (1.4)

 

7 (13.0)

2 (2.9)

 

 Private Insurance

5 (12.5)

18 (24.7)

 

2 (3.7)

10 (14.3)

 

 Workman’s Compensation

0 (0.0)

3 (4.1)

 

0 (0.0)

2 (2.9)

 

Primary Diagnosis for Implant (%)

  

0.25

  

0.006

 Complex Regional Pain Syndrome

4 (10.0)

13 (17.8)

 

3 (5.6)

10 (14.3)

 

 Cranial Neuropathy

1 (2.5)

2 (2.7)

 

1 (1.9)

3 (4.3)

 

 Failed Back Surgery Syndrome

18 (45.0)

32 (43.8)

 

19 (35.2)

32 (45.7)

 

 Lumbar Radiculopathy

8 (20.0)

15 (20.5)

 

12 (22.2)

15 (21.4)

 

 Non-Surgical Refractory Back Pain

5 (12.5)

1 (1.4)

 

9 (16.7)

1 (1.4)

 

 Neuropathic Pain

3 (7.5)

9 (12.3)

 

4 (7.4)

8 (11.4)

 

 Other Chronic Pain

1 (2.5)

1 (1.4)

 

6 (11.1)

1 (1.4)

 

Revision or Explant (%)

6 (15.0)

17 (23.3)

0.42

9 (16.7)

8 (11.4)

0.564

Patient Status (%)

  

0.036

  

0.198

 Alive

33 (82.5)

64 (87.7)

 

45 (83.3)

56 (80.0)

 

 Deceased

0 (0.0)

5 (6.8)

 

0 (0.0)

4 (5.7)

 

 Unknown

7 (17.5)

4 (5.5)

 

9 (16.7)

10 (14.3)

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