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Table 1 Summary of preoperative characteristics

From: Return to flight duty (RTFD) after posterior lumbar spine surgery for symptomatic lumbar disc herniation (LDH) and lumbar isthmic spondylolisthesis (LIS) in Chinese military pilots

Characteristic

Value

Number of pilots

24

Mean age at operation in years (IQR)

34.5 ( 30.0, 41.8)

Sex, no. (%)

 Male

24 (100.0)

 Female

0 (0.0)

Hight, cm (range)

172.4 (165–178)

Weight, kg (range)

73.8 (54–90)

BMI, kg/m2 (range)

24.8 (19.8–30.1)

Flying time, hours (IQR)

2075.0 (1007.5, 3075.0)

Flight rating, no. (%)

 Third-grade

5 (20.8)

 Second-grade

2 (8.3)

 First-grade

16 (66.7)

 Top-grade

1 (4.2)

Service, no. (%)

 Air Force

20 (83.3)

 Army

4 (16.7)

Aircraft, no. (%)

 Fixed wing

19 (79.2)

 Rotary wing

5 (20.8)

Tobacco use, no. (%)

 Yes

5 (20.8)

 No

19 (79.2)

Main indication for surgery, no. (%)

 LDH

18 (75.0)

 LIS

6 (25.0)

  1. BMI, body mass index; LDH, lumbar disc herniation; LIS, lumbar isthmic spondylolisthesis. The median and inter-quartile range (IQR) present continuous variables. Categorical variables are expressed as counts and percentages