Table 2.

Numerical rating scale for pain assessment

Score	Interpretation	Classification of patients according to drug response	Class definition
0	No pain	Responder	NRS of 0-3 after being given 1 dose of celecoxib
1-3	Mild pain	Responder	NRS of 0-3 after being given 1 dose of celecoxib
4-6	Moderate pain	Intermediate	NRS of 4-6 after being given more than 1 dose of celecoxib
7-10	Severe pain	Non-responder	NRS of 7-10 or those who have been given celecoxib but still needed rescue medications

NRS = numerical rating scale.