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Table 2 Newcastle-Ottawa scale for the non-RCTs

From: Efficacy of intravenous acetaminophen in multimodal management for pain relief following total knee arthroplasty: a meta-analysis

Author

Selection

Comparability

Outcomes

Total score

Kelly [15]

***

**

**

7

Nwagbologu [17]

**

**

**

6

Ciummo [23]

***

**

***

8

Huang [21]

**

**

**

6

  1. * represent 1 score