Table I.
Baseline characteristics of the included studies.
| Sample size, n | |||||
|---|---|---|---|---|---|
|
|
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| First author, year (ref) | Ethnicity | Case | Control | Gene polymorphism | Genotyping method |
| Abe et al, 2002 (15) | Asian | 145 | 145 | 936C/T (rs3025039), 1612G/A (rs10434), 702C/T | PCR-RFLP |
| Ricketts et al, 2009 (19) | Caucasian | 343 | 321 | −1154G/A (rs1570360) | PCR |
| Bruyère et al, 2010 (20) | Caucasian | 51 | 202 | 936C/T (rs3025039), −1154G/A (rs1570360),−2549I/D, −460T/C (rs833061), 405G/C (rs2010963) | PCR |
| Ajaz et al, 2011 (21) | Asian | 143 | 106 | −2578C/A (rs699947) 936C/T (rs3025039) | PCR-RFLP |
| Sáenz-López et al, 2013 (22) | Caucasian | 216 | 216 | 936C/T (rs3025039), −460T/C (rs833061), −2578C/A (rs699947) | TaqMan |
PCR-RFLP, polymerase chain reaction-restriction fragment length polymorphism.