Table 4.

Effect of morphine versus placebo on constipation at the end of the four day treatment period. Variable is measured on a categorical scale; response items are collapsed into dichotomous functional groupings. Values are numbers

	Constipation on placebo
Constipation on morphine	None or mild	Moderate or severe	Totals
None or mild	26	1	27
Moderate or severe	9	1	10
Totals	35	2	37
			P=0.021