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Fig 1.

Flow chart.

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Table 1.

The characteristics of qualified researches.

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Table 1 Expand

Table 2.

Quality assessment.

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Table 2 Expand

Fig 2.

Forest plot displaying a meta-analysis of the delirium.

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Fig 2 Expand

Fig 3.

Forest plot displaying a meta-analysis of the length of stay.

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Fig 4.

Forest plot displaying a meta-analysis of the re-admissions.

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Fig 4 Expand

Fig 5.

Forest plot displaying a meta-analysis of the ADL function.

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Fig 5 Expand

Table 3.

Risk stratification methods for elderly surgical patients.

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Table 3 Expand