Table 6.
Univariate and multivariate binary logistic regression analysis for the reporting COI at full-text
| Univariate (No COI reporting as the reference category) | Multivariate (all variables included) | Multivariate (backward selection) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Variables | B | OR (95%CI) | P | B | OR (95%CI) | P | B | OR (95%CI) | P |
| Type of primary studies based on the full-text | 0.31 | ||||||||
| In-vitro or animals | Ref | ||||||||
| Humans | -0.06 | 0.94 (0.47–1.88) | 0.86 | ||||||
| Both | 1.50 | 4.48 (0.55–36.57) | 0.16 | ||||||
| Review type | |||||||||
| Intervention | Ref | ||||||||
| Non-intervention | 0.14 | 1.15 (0.69–1.91) | 0.60 | ||||||
| Review registration based on full-text | |||||||||
| Yes | Ref | Ref | Ref | ||||||
| No | -0.55 | 0.58 (0.40–0.85) | < 0.01* | -0.49 | 0.61 (0.39–0.95) | 0.03* | -0.58 | 0.56 (0.36–0.86) | < 0.01* |
| Continents of origin of the reviews | 0.01* | 0.02* | 0.01* | ||||||
| North America | Ref | Ref | Ref | ||||||
| South America | -0.41 | 0.67 (0.33–1.35) | 0.26 | -0.95 | 0.39 (0.18–0.85) | 0.02* | -0.92 | 0.40 (0.18–0.86) | 0.02* |
| Europe | -0.19 | 0.83 (0.42–1.64) | 0.59 | -0.50 | 0.61 (0.30–1.25) | 0.18 | -0.43 | 0.65 (0.32–1.32) | 0.24 |
| Asia | 0.41 | 1.51 (0.72–3.17) | 0.28 | 0.13 | 1.14 (0.51–2.55) | 0.76 | 0.24 | 1.27 (0.59–2.76) | 0.55 |
| Africa | -0.70 | 0.49 (0.12–2.03) | 0.33 | -0.78 | 0.46 (0.10–2.06) | 0.31 | -0.67 | 0.51 (0.12–2.25) | 0.37 |
| Oceania | -1.11 | 0.33 (0.12–0.88) | 0.03* | -0.86 | 0.42 (0.15–1.24) | 0.12 | -0.80 | 0.45 (0.16–1.30) | 0.14 |
| Countries of origin of the reviews | |||||||||
| Developing | Ref | ||||||||
| Developed | -0.22 | 0.80 (0.55–1.17) | 0.25 | ||||||
| Abstract type | |||||||||
| Structured | Ref | Ref | Ref | ||||||
| Non-structured | 0.64 | 1.90 (1.17–3.08) | 0.01* | 0.72 | 2.06 (1.22–3.48) | < 0.01* | 0.69 | 2.00 (1.19–3.35) | < 0.01* |
| Review access based on homepage | |||||||||
| Yes | Ref | Ref | |||||||
| No | -0.65 | 0.52 (0.36–0.77) | < 0.01* | -0.26 | 0.77 (0.48–1.23) | 0.27 | |||
| Review access based on internet | |||||||||
| Yes | Ref | ||||||||
| No | 0.34 | 1.41 (0.59–3.35) | 0.44 | ||||||
| Journal type | |||||||||
| Dentistry | Ref | Ref | |||||||
| Other | 0.76 | 2.13 (1.15–3.97) | 0.02* | -0.13 | 0.88 (0.42–1.82) | 0.73 | |||
| Journal access | |||||||||
| Subscription or hybrid | Ref | Ref | Ref | ||||||
| Open access | 1.31 | 3.71 (2.15–6.40) | < 0.01* | 0.96 | 2.62 (1.36–5.07) | < 0.01* | 1.13 | 3.10 (1.76–5.45) | < 0.01* |
| Journal reporting a COI policy in the instructions to authors | |||||||||
| Yes | Ref | ||||||||
| No | -0.80 | 0.45 (0.17–1.15) | 0.10 | ||||||
| Journal reporting the type of COI in the instructions to authors | 0.29 | ||||||||
| Financial | Ref | ||||||||
| Non-financial | - | - | - | ||||||
| Both | 0.44 | 1.56 (0.87–2.79) | 0.14 | ||||||
| Only say that authors need to report COI | 0.47 | 1.59 (0.58–4.38) | 0.37 | ||||||
| No information | -0.41 | 0.67 (0.23–1.95) | 0.46 | ||||||
| Journal impact factor** | -0.08 | 0.93 (0.83–1.04) | 0.21 | ||||||
| Number of citations*** | -0.003 | 0.997 (0.995–0.999) | < 0.01* | -0.002 | 0.998 (0.996–1.000) | 0.08 | |||
| Number of authors | 0.21 | 1.23 (1.11–1.37) | < 0.01* | 0.22 | 1.25 (1.11–1.42) | < 0.01* | 0.24 | 1.27 (1.12–1.43) | < 0.01* |
| Nagelkerke R2 | Not applicable | 0.146 | 0.139 | ||||||