Table 1 Study characteristics
Category | Mean, (Median and Range) | Characteristic | Number | Percentage N = 64 |
|---|---|---|---|---|
IF | 11.72(8.06, 0–39.89) | Non-SCI | 7 | 10.9% |
IF ≤ 5 | 16 | 25.0% | ||
5 < IF ≤ 10 | 26 | 40.6% | ||
10 < IF ≤ 15 | 4 | 6.3% | ||
IF ≥ 15 | 11 | 17.2% | ||
Number of institutions | 9.27(7, 1–37) | Single institution | 2 | 3.1% |
1 < Number of institutions ≤ 5 | 19 | 29.7% | ||
5 < Number of institutions ≤ 10 | 22 | 34.4% | ||
10 < Number of institutions ≤ 15 | 11 | 17.2% | ||
15 < Number of institutions | 10 | 15.6% | ||
Number of authors | 14.53(2–57) | Single author | 0 | 0% |
1 < Number of authors ≤ 5 | 9 | 14.1% | ||
5 < Number of authors ≤ 10 | 26 | 40.6% | ||
10 < Number of authors ≤ 15 | 10 | 15.6% | ||
15 < Number of authors | 19 | 29.7% | ||
Number of included studies | 57.36(17.5, 0–728) | Number of included studies = 0 | 2 | 3.1% |
0 < Number of included studies ≤ 10 | 21 | 32.8% | ||
10 < Number of included studies ≤ 20 | 10 | 15.6% | ||
20 < Number of included studies ≤ 50 | 14 | 21.9% | ||
50 < Number of included studies ≤ 100 | 9 | 14.1% | ||
100 < Number of included studies | 8 | 12.5% | ||
Follow the PRISMA statement | / | Yes | 50 | 78.1% |
No/Unclear | 14 | 21.9% | ||
International collaborations | / | Yes | 38 | 59.4% |
No | 26 | 40.6% | ||
Funding | / | Yes | 52 | 81.3% |
No/Unclear | 12 | 18.8% | ||
Registration | / | Yes | 52 | 81.3% |
No/Unclear | 12 | 18.8% |