Evidence for the association between psychological stress and peri-implant health among middle-aged and elderly adults: A systemic review

Table 1 Modified Newcastle–Ottawa Scale for included studies

Ref.	ROB	Selection		Study design				Outcome assessment		Confounding factor assessment		Data analysis		Study results
		Representative sample	Adequate sample size	Accuracy of exposure/risk factors	Data quality control	Definition of cases and controls	Selection of control group	Accuracy of outcome	Timing of outcome assessment	Control of confounding factors	Stratification or multivariate analysis	Appropriateness of statistical methods	Reporting of results	Consistency of results	Openness and reproducibility
Soysal et al[21], 2024	Medium				+	+	+	+	+				+	+	+
Strooker et al[20], 2022	Low			+	+	+	+	+		+	+	+	+	+	+
Ali et al[19], 2022	High							+						+
Alresayes et al[18], 2021	Medium				+	+	+	+				+		+	+

ROB: Risk of bias.