Table 2 The main characteristics of included studies
Characteristic | N (%) | Mean (SD) | t/F | P |
|---|---|---|---|---|
Type of study | ||||
Cohort studies | 38 (23.03) | 15.58 ± 1.70* | ||
Case-control studies | 66 (40.00) | 13.77 ± 1.56 | 14.53 | < 0.001 |
Cross-sectional studies | 61 (36.97) | 14.05 ± 1.86 | ||
Funding support | ||||
No | 143 (87.27) | 14.15 ± 1.79 | −2.41 | 0.017 |
Yes | 21 (12.73) | 15.17 ± 2.01 | ||
Number of published papers during postgraduate period | ||||
< 2 | 60 (36.36) | 13.86 ± 1. 67 | −2.37 | 0.019 |
≥ 2 | 105 (63.64) | 14.56 ± 1.90 | ||
Number of the statistical methods | ||||
< 3 | 73 (44.24) | 13.80 ± 1.77 | −3.12 | 0.012 |
≥ 3 | 92 (55.76) | 14.68 ± 1.81 | ||
Year of published | ||||
2014 | 33 (20) | 14.29 ± 1.83 | ||
2015 | 48 (29.10) | 13.80 ± 1.89 | ||
2016 | 47 (28.48) | 14.31 ± 1.61 | 2.57 | 0.040 |
2017 | 31 (18.79) | 14.71 ± 1.89 | ||
2018 | 6 (3.64) | 15.94 ± 1.84* | ||