Table 7.

Number of patient withdrawals per treatment group for whole population and subpopulation of patients who had taken neither morphine nor fentanyl before study (naive patients). Values are numbers (percentages) of patients unless stated otherwise

	Fentanyl (n=250)	Morphine (n=238)	Ratio of fentanyl:morphine
Total population
Total No of withdrawals	39 (16)	21 (9)	1.9
Withdrawals owing to adverse events	27 (11)	10 (4)	2.7
Naive population	n=63	n=61
Total No of withdrawals	10 (16)	11 (18)	0.9
Withdrawals owing to adverse events	7 (11)	6 (10)	1.2