Table 2. The levels of serum leptin in the each primary study.
| Author | Year | Cases | Controls | Unit | Method | Study Quality Score | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Mean | SD1 | N | Mean | SD | N | |||||
| Aleman MR | 2002 | 7.11 | 0.91 | 76 | 18.50 | 4.17 | 30 | ng/ml | RIA2 | 7 |
| Carpagnano GE | 2007 | 45.3 | 19.9 | 32 | 22.7 | 0.4 | 20 | ng/ml | ELISA3 | 7 |
| Dong JH | 2009 | 8.67 | 2.28 | 64 | 5.75 | 1.70 | 70 | ng/ml | ELISA | 7 |
| Hong X | 2013 | 6.45 | 2.55 | 41 | 7.05 | 2.61 | 51 | ng/ml | ELISA | 7 |
| Jamieson NB | 2004 | 6.7 | 11.85 | 20 | 15.8 | 9.1 | 13 | ng/ml | ELISA | 7 |
| Kerenidi T | 2013 | 3.87 | 8.80 | 80 | 10.76 | 8.42 | 40 | ng/ml | RIA | 7 |
| Luo NP | 2008 | 5.72 | 1.16 | 42 | 4.18 | 0.51 | 30 | ng/ml | RIA | 6 |
| Mou WJ | 2014 | 3.78 | 3.30 | 27 | 1.73 | 0.94 | 27 | ng/ml | RIA | 8 |
| Song CH | 2014 | 9.66 | 5.73 | 126 | 4.75 | 2.98 | 60 | ng/ml | ELISA | 7 |
| Tao XN | 2003 | 1.50 | 0.80 | 34 | 3.20 | 1.80 | 25 | ng/ml | RIA | 6 |
| Tas F | 2005 | 6.2 | 44.5 | 28 | 12.5 | 6.88 | 15 | ng/ml | ELISA | 5 |
| Terzidis A | 2009 | 9.30 | 9.20 | 66 | 7.1 | 5.8 | 132 | ng/ml | RIA | 7 |
| Werynska B | 2009 | 9.0 | 8.85 | 40 | 10 | 7.6 | 15 | ng/ml | ELISA | 6 |
| Zhang ZH | 2003 | 6.81 | 6.3 | 97 | 6.44 | 4.59 | 66 | ng/ml | RIA | 5 |
| Cases with Weight Loss | Cases without Weight Loss | |||||||||
| Hong X | 2013 | 5.12 | 1.38 | 15 | 7.22 | 2.76 | 26 | ng/ml | ELISA | 7 |
| Werynska B | 2009 | 6.0 | 7.8 | 20 | 12 | 9 | 20 | ng/ml | ELISA | 6 |
1: standard deviation; 2: radioimmunoassay; 3: enzyme-linked immunosorbent assay