Question: is this a 2) strong advice, 1) weak advice 0) no advice?

Postoperative nausea and vomiting (PONV) was lower in group R, whereas itching and urticaria were lower in group N. Opioids and inhalant anesthetics are both known to be major risk factors for PONV,24,25 whereas propofol is known to reduce the degree of PONV26–29. 
user
This is no advice
assistant