Barriers	N	Mean ranks	SD	Group differences
Lack of time	460	2.51	2.15	All
Forgetting	460	3.32	2.04	All
Low levels of activity at baseline	460	3.55	2.01	All
Pain with exercise	460	4.45	2.01	All
Low self-efficacy a	460	4.97	1.94	All, except b
Anxiety/depression b	460	5.32	1.94	All, except a & c
Helplessness c	460	5.57	1.75	All, except b
Lack of social support	460	6.33	1.71	All