COMPARISON 1: FDP versus RPDP for Treated and untreated Shortened Dental Arches (31–38).

EXPLANATION OF TABLE ABOVE:*The basis for the assumed risk (e.g. the median control group risk across studies) is provided in footnotes. The corresponding risk (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI). KEY: CI: Confidence interval; RR: Risk ratio; HR: Hazard ratio.
Explanation for the GRADE Working Group QUALITY of evidence: High quality: Further research is very unlikely to change our confidence in the estimate of effect. Moderate quality: Further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate. Low quality: Further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate. Very low quality: We are very uncertain about the estimate.
REASONS for the QUALITY of the Evidence: 1High risk of bias for blinding, selective reporting bias and other bias; 2Small sample size; 3No significant difference (p = 0.092).

上表说明：*假设风险的依据（例如各研究中对照组风险的中位数）详见脚注。对应风险（及其95%置信区间（Confidence Interval, CI））基于比较组的假设风险及干预措施的相对效应（及其95% CI）。
术语说明：CI=置信区间（Confidence Interval）；RR=相对危险度（Risk Ratio）；HR=危险比（Hazard Ratio）。

GRADE工作组证据质量说明：
高质量：进一步研究极不可能改变我们对效应估计值的可信度。
中等质量：进一步研究可能对我们的效应估计值的可信度产生重要影响，并可能改变该估计值。
低质量：进一步研究极有可能对我们的效应估计值的可信度产生重要影响，并很可能改变该估计值。
极低质量：我们对该估计值非常不确定。

证据质量评级理由：
1. 盲法、选择性报告偏倚及其他偏倚存在高偏倚风险；
2. 样本量较小；
3. 无统计学显著性差异（p=0.092）。