Table 1
Rhodes index of nausea, vomiting and retching

	0	1	2	3	4
1. In the last 6, 24 hours, I threw up ( ) times.	No	1−2	3−4	5−6	>7
2. In the last 6, 24 hours, from retching and dry heaves, I have felt ( ) distress.	No	Mild	Moderate	Great	Severe
3. In the last 6, 24 hours, from vomiting or throwing up, I have felt ( ) distress.	No	Mild	Moderate	Great	Severe
4. In the last 6, 24 hours, I have felt nauseated or sick to my stomach.	No	≤1 hr	2−3 hr	4−6 hr	>6 hr
5. In the last 6, 24 hours, from nausea/sickness to my stomach, I have felt ( ) distress	No	Mild	Moderate	Great	Severe
6. In the last 6, 24 hours, each time I threw up, I produced a ( ) amount.	No	Small	Moderate	Large	Very large
		(<1/2 cups)	(1/2−2 cups)	(2−3 cups)	(>3 cups)
7. In the last 6, 24 hours, I have felt nauseated or sick to my stomach ( ) times.	No	1−2	3−4	5−6	>7
8. In the last 6, 24 hours, I have had periods of retching or dry heaves without bringing anything up ( ) times.	No	1−2	3−4	5−6	>7
Total experience score: sum of all scores