Table 3.

Health profile variables

	(N=138) Random		(N=80) Convenience
	X	SD	X	SD	P
Physical functioning	64.64	28.22	45.88	29.22	.0001
Role physical	62.32	40.44	58.75	43.05	NS
Bodily pain	70.39	25.93	65.26	28.29	NS
General health	59.38	21.08	55.56	19.65	NS
Vitality	59.57	21.27	48.13	27.43	.0007
Social functioning	81.36	26.79	83.15	26.10	NS
Role emotional	82.15	32.27	80.83	35.91	NS
Mental health	80.99	17.36	79.40	17.16	NS