Table 2 Summary of risk of bias of included studies
From: A systematic review and meta-analysis of the role of sugar-free chewing gum on Streptococcus mutans
| Â | Study design | Randomisation | Allocation concealment | Masking of participants | Masking of outcome assessors | Incomplete outcome reporting | Selective reporting | Other bias |
|---|---|---|---|---|---|---|---|---|
Hoerman [16] | RCT | Unclear | High risk | unclear | Unclear | Low risk | Low risk | Low risk |
Hildebrandt and Sparks [17] | RCT | Unclear | Unclear | Unclear | Low risk | Unclear | Unclear | Unclear |
Thaweboon et al. [18] | Other | Unclear [1] | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear |
Makinen et al. [19] | RCT | Unclear | Unclear | Low risk | Low risk | High risk | Unclear | Unclear |
Wang et al. [20] | RCT | Low risk | Unclear | Unclear | Unclear | Low risk | Unclear | Unclear |
Haresaku et al. [20] | Patient preference non-randomised trial | High risk [2] | Unclear | Unclear | Low risk | High risk | Unclear | Unclear |
Calgar et al. [22] | RCT | Low risk | Unclear | Low risk | Low risk | Unclear | Unclear | Low risk |
Campus et al. [23] | RCT | Low risk | Low risk | Low risk | Low risk | Unclear | Unclear | Low risk |
Hildebrandt et al. [24] | RCT | Low risk | Unclear | High risk | Low risk | Low risk | Unclear | Unclear |
Seki et al. [25] | RCT | Low risk | Low risk | Low risk | Unclear | High risk | Unclear | High risk |
Alamoudi et al. [26] Hanno et al. [27] | RCT | Unclear | High risk | High risk | Unclear | Unclear | Unclear | Unclear |
Al-haboubi et al. [28] | RCT | Low risk | Low risk | High risk | Low risk | Unclear | Unclear | Low risk |
Ghassemi et al. [29] | RCT | Unclear | Unclear | Low risk | Unclear | Low risk | Unclear | Unclear |