Table I.
Summary of the studies included in the meta-analysis.
| Quality scores
|
|||||||||
|---|---|---|---|---|---|---|---|---|---|
| Author/year (ref.) | Country | Method | Cut-off | TP | FP | FN | TN | STARD | QUADAS |
| Fiorelli et al, 2011 (51) | Italy | ELISA | 652 pg/ml | 31 | 5 | 18 | 25 | 15 | 11 |
| Chen et al, 2010 (50) | China | PCR | NA | 76 | 4 | 16 | 32 | 14 | 10 |
| Zhou et al, 2009 (49) | China | ELISA | 1.6 ng/ml | 44 | 25 | 18 | 39 | 17 | 12 |
| Duysinx et al, 2008 (48) | Belgium | ELISA | 382 pg/ml | 44 | 18 | 20 | 21 | 17 | 11 |
| Cheng et al, 2008 (47) | China | PCR | NA | 11 | 9 | 3 | 5 | 12 | 9 |
| Xue et al, 2007 (46) | China | ELISA | 945.7 pg/ml | 34 | 7 | 8 | 38 | 17 | 12 |
| Shu et al, 2007 (45) | China | ELISA | 959.25 pg/ml | 15 | 2 | 17 | 47 | 20 | 13 |
| Sack et al, 2005 (44) | Germany | ELISA | NA | 77 | 50 | 19 | 68 | 16 | 11 |
| Momi et al, 2002 (43) | Japan | ELISA | 2000 pg/ml | 38 | 14 | 0 | 75 | 15 | 11 |
| Yeo et al, 1993 (42) | USA | IFA | 10 pm | 18 | 7 | 7 | 20 | 11 | 10 |
TP, true positive; FP, false positive; FN, false negative; TN, true negative; QUADAS, quality assessment for studies of diagnostic accuracy; STARD, standards for reporting diagnostic accuracy; ELISA, enzyme-linked immunosorbent assay; PCR, polymerase chain reaction; IFA, immunofluorometric assay; NA, not applicable.