Table 3.
Association between publication characteristics and methodological quality of SRs on total hip/knee arthroplasty
| Bibliographical characteristics | Number (%) | AMSTAR score | Results |
|---|---|---|---|
| 1、published year | |||
| 2014 | 30 (47.6%) | 6.40 ± 1.35 | P = 0.375 |
| 2015 | 33 (52.4%) | 6.32 ± 1.19 | |
| 2、surgical type | |||
| THA | 25 (39.7%) | 6.08 (5.46–7.09)b | △P = 0.435 |
| TKA | 37 (58.7%) | 6.42 (5.58–7.50)b | |
| THA and TKA | 1 (1.59%) | – | |
| 3、language | |||
| Chinese | 15 (23.8%) | 6.67 (5.17–6.08)b | △P = 0.052 |
| English | 48 (76.2%) | 5.67 (5.67–7.50)b | |
| 4、location of the corresponding author | |||
| Asia | 50 (79.4%) | 6.17 (5.5–7.19)b | △P = 0.098 |
| America | 9 (14.3%) | 6.09 (4.34–7.84)b | |
| Europe | 4 (6.3%) | 7.75 (6.37–9.5)b | |
| 5、Number of SRs that included a PRISMA-like flow | |||
| Included a PRISMA-like flow | 53 (84.1%) | 6.48 ± 1.20 | P = 0.752 |
| Did not include a PRISMA-like flow | 10 (15.9%) | 5.73 ± 1.45 | |
| 6、Was the SRs published in journal | |||
| Number of SRs published in journal | 59 (93.7%) | 6.17 (5.50–7.50)b | △P = 0.903 |
| Number of SRs not published in journal | 4 (6.3%) | 6.34 (5.62–7.29)b | |
| 7、Tools for assessing risk of bias of primary studies | |||
| Cochrane | 35 (55.6%) | 6.67 (5.50–7.50)b | △P = 0.312 |
| Jadad scale | 11 (17.5%) | 5.75 (5.67–6.75)b | |
| The PEDro scale | 2 (3.2%) | 7.46 | |
| Other single assessment tool | 7 (11.1%) | 6.00 (4.5–7.00)b | |
| Two or more assessment tools | 6 (9.5%) | 7.00 (5.63–8.13)b | |
| Not reported | 2 (3.2%) | 5.45 | |
| Average(range) | |||
| 8、Total number of authors in SRs | 4.9 (1–8) | – | #Nonlinear relation |
| 9、Number of databases searched | 4.5 (1–12) | – | #Nonlinear relation |
| 10、Median impact factor of the journal for which the included study was published | 1.864 (0.293–5.228) | – | #P = 0.006* |
Values in AMSTAR score are mean ± standard deviation except for bmedian (the 25th and 75th percentile). Values in results are tested in t-test except for: △non-parametric test; #linear regression test. *statistically significant