Table 4 Risk factors for incidence of PONV in multivariate analysis

Female sex

14.7

4.16–51.9

0.00003

Non-smoker

0.55

0.09–3.42

0.52

History of motion sickness

3.89

1.02–14.8

0.046

Use of nitrous oxide

0.78

0.24–2.55

0.26

Duration of surgery

1.00

0.99–1.00

0.59

Fentanyl concentration

1.64

0.31–8.83

0.57

rs1333114 G > A

0.48

0.16–1.44

0.19

rs11232965 T > C

0.16

0.05–0.51

0.002