Table 3. Characteristics and results of the present study compared with the former five meta-analyses.
| First author | Year of publication | Time of data updated | No. of studies | No. of cases | No. of controls | Quality assessment | Overall results | Asians | Caucasians | Azoo | OAT | Oligo | PB | HB |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tüttelmann F | 2007 | NA | 8 | 1843 | 1791 | No | + | NA | NA | NA | NA | NA | NA | NA |
| Gupta N | 2011 | Mar. 2011 | 14 | 3094 | 2877 | No | + | NA | NA | + | − | + | NA | NA |
| Wu W | 2012 | Sep. 2010 | 9 | 2275 | 1958 | No | + | + | − | + | − | NA | NA | NA |
| Wei B | 2012 | Jan. 2011 | 11 | 2217 | 2312 | No | − | + | − | NA | NA | NA | NA | NA |
| Weiner AS | 2014 | Apr. 2012 | 13 | 2972 | 3436 | No | − | NA | NA | − | NA | − | NA | NA |
| The present study | NA | Jun. 2014 | 26 | 5575 | 5447 | Yes | + | + | + | + | + | − | + | + |
Azoo-azoospermia; OAT-oligoasthenoteratozoospermia; Oligo-oligozoospermia
HB, hospital-based controls; PB, population-based controls
+, positive result
−, negative result
NA, not available