Table 4.
Records identified by each of the bibliographic databases and citation tracking resources
| Database | Total records identified | Total included studies available | Included studies retrieved | Recall % (n = 40) | Precision % | Number needed to read (NNR) |
|---|---|---|---|---|---|---|
| MEDLINE |
8279 |
39 |
30 |
75% |
0.36% |
276 |
| Embase |
13176 |
38 |
25 |
62.5% |
0.19% |
527 |
| PsycINFO |
5475 |
29 |
21 |
52.5% |
0.38% |
261 |
| SCI |
7048 |
40 |
12 |
30% |
0.17% |
587 |
| CENTRAL |
1059 |
34 |
11 |
27.5% |
1.04% |
96 |
| Google scholar |
1680 |
38 |
8 |
20% |
0.48% |
210 |
| Scopus |
1173 |
39 |
8 |
20% |
0.68% |
147 |
| Web of Science |
1095 |
40 |
8 |
20% |
0.73% |
137 |
| ASSIA |
881 |
16 |
4 |
10% |
0.45% |
220 |
| OVIDSP MEDLINE |
213 |
39 |
2 |
5% |
0.94% |
107 |
| Citation searching all sources | 1789 | 40 | 9 | 22.5% | 0.5% | 199 |