Table 4.

Estimated NNTB for preventing PONV (PC6 acupoint stimulation versus sham)

Control event rate	Nausea	95% CI	Vomiting	95% CI
10%	31	25 to 43	25	20 to 34
20%	16	13 to 22	13	10 to 17
30%	10	8 to 14	8	7 to 11
40%	8	6 to 11	6	5 to 9
50%	6	5 to 9	5	4 to 7
60%	5	4 to 7	4	3 to 6
70%	4	4 to 6	4	3 to 5
80%	4	3 to 5	3	3 to 4
90%	3	3 to 5	3	2 to 4

CI = confidence interval

NNTB = number needed to treat for an additional beneficial outcome

PC6 = pericardium acupoint

PONV = postoperative nausea and vomiting