Table 2.

Prevalence of RLS in patients with cryptogenic events compared with patients with events of known cause

	Cryptogenic	Known cause	Odds ratio (95% CI)	p value
RLS of any size
Age ≤60 years	29/74 (39%)	16/52 (31%)	1·45 (0·68–3·07)	0·33
Age >60 years	68/190 (36%)	44/207 (21%)	2·06 (1·32–3·23)	0·001
Total	97/264 (37%)	60/259 (23%)	1·93 (1·32–2·82)	0·001
Large RLS only
Age ≤60 years	16/74 (22%)	12/52 (23%)	0·92 (0·39–2·15)	0·85
Age >60 years	25/190 (13%)	15/207 (7%)	1·94 (0·99–3·80)	0·05
Total	41/264 (16%)	27/259 (10%)	1·58 (0·94–2·66)	0·08

Data are n/N (%) unless otherwise indicated. Data are stratified by age and size of the shunt. RLS=right-to-left shunt.