|
Authors
|
Year
|
Country
|
Ethnicity
|
Gender (M/F)
| |
Age, mean (SD)
| |
Matching
|
Control source
|
Genotyping method
|
IDD diagnosis
|
IDD severity standard
|
Study quality
|
|---|
| | | | |
Case
|
Control
|
Case
|
Control
| | | | | | |
|---|
|
Zhang [10]
|
2015
|
China
|
Han Chinese
|
198/114
|
121/75
|
49.54(8.87)
|
48.65(8.12)
|
Age and gender
|
Healthy subjects
|
PCR-RFLP
|
Symptoms, MRI
|
Schneiderman’s classification
|
11
|
|
Du [8]
|
2015
|
China
|
Han Chinese
|
73/80
|
62/69
|
40.2(5.1)
|
38.6(5.0)
|
Age and gender
|
Healthy subjects
|
PCR-RFLP
|
Symptoms, MRI
|
Schneiderman’s classification
|
11
|
|
Xu [9]
|
2015
|
China
|
Han Chinese
|
54/46
|
58/42
|
59
|
49
|
Age and gender
|
Healthy subjects
|
PCR- RFLP
|
Symptoms, MRI
|
Schneiderman’s classification
|
10
|
-
M male, F female, SD standard deviation, IDD intervertebral disc degeneration, PCR-RFLP polymerase chain reaction–restriction fragment length polymorphism, MRI magnetic resonance imaging
