Table 1.

Sample of Imaginary Data from an Experiment Testing Two Antiemetics for Use in Controlling Postoperative Nausea and Vomiting

No	Antiemetic	Age (yr)	Weight (kg)	Opioid used	Onset time (h)	PONV	Event	Inclusion
1	A	48	78.5	Remifentanil	4	Not reported	Censored	Excluded
2	B	48	86.7	Remifentanil	17	Reported	Event	Included
3	A	54	88.3	Fentanyl	21	Not reported	Censored	Excluded
25	B	77	53	Remifentanil	24	Not reported	Censored	Included
104	B	58	60	Fentanyl	1	Reported	Event	Included

In this imaginary experiment, two antiemetics (A or B) were administered, and each patient was randomly allocated to a group receiving one of them. Intraoperative opioid used was recorded in the “opioid used” column. Postoperative nausea and vomiting (PONV) and its onset time were also recorded. For statistical tests such as Student’s t-test, patients 1 and 3 patients would normally be excluded (as indicated in the column labeled “Inclusion”). For survival analysis, all the patients would be included either as censored cases (numbers 1, 3, 25) or as ordinary event cases (numbers 2, 104).