Table 1 Patient demographics.

From: Risk factors for reoperation after lumbar spine surgery in a 10-year Korean national health insurance service health examinee cohort

Category

Number

Sex

Male

3076 (49%)

Female

3224 (51%)

Diagnosis

Lumbar disc herniation

1739 (28%)

Lumbar spinal stenosis without spondylolisthesis

466 (7%)

Lumbar spinal stenosis with spondylolisthesis

3840 (61%)

Lumbar spondylolysis

255 (4%)

Surgical method

Open discectomy

2696 (43%)

PELD

242 (4%)

Fusion

2433 (39%)

Laminectomy

929 (14%)

Age, years

40 ~ 49

908 (14%)

50 ~ 59

2007 (32%)

60 ~ 69

2272 (36%)

70 ~ 79

1047 (17%)

80 ~ 

66 (1%)

Residence

Seoul

940 (15%)

Pusan

356 (6%)

Daegu

248 (4%)

Incheon

330 (4%)

Gwangju

204 (3%)

Daejeon

224 (4%)

Ulsan

161 (3%)

Gyeonggi-do

1212 (19%)

Gangwon-do

244 (4%)

Chungbuk-do

237 (4%)

Chungnam-do

420 (7%)

Jeonbuk-do

371 (6%)

Jeonnam-do

420 (7%)

Gyeongbuk-do

441 (7%)

Gyeongnam-do

433 (6%)

Jeju-do

59 (1%)

Insuracne eligibility

1

1254 (19%)

2

861 (17%)

5

1211 (18%)

6

2834 (44%)

7

111 (1.5%)

8

29 (0.5%)

Health insurance premium

Medical benefit

140 (2%)

1

392 (6%)

2

365 (6%)

3

384 (6%)

4

479 (8%)

5

480 (8%)

6

625 (10%)

7

645 (10%)

8

727 (11%)

9

981 (15%)

10

1082 (18%)

BMI, kg/m2

 < 20

345 (5%)

20 <  < 25

3320 (52%)

25 < 

2635 (43%)

Smoking

Yes

1158 (18%)

No

5142 (82%)

Alcohol drinking

Yes

2194 (35%)

No

4106 (65%)

Exercise

1

3737 (59%)

2

1846 (29%)

3

717 (12%)

CCI

0

1650 (26%)

1–2

3258 (51%)

 ≥ 3

1392 (23%)

Blood sugar (mg/dl)

100.49 ± 30.43

Total Cholesterol (mg/dl)

202.15 ± 38.14

Hemoglobin (g)

13.78 ± 1.44

  1. PELD, Percutaneous endoscopic lumbar discectomy; BMI, Body mass index;
  2. CCI, Charlson comorbidity index.