Table1.

Skewness of patient delay time data in studies that reported means and SD

Study		Mean	SD	SD ×2	Likely skewness
Before and after studies
Addo et al 66	B	374	512	1024	Skewed
	A	296.8	356.3	712.6
Diercks et al 56	B	232	271.3	542.6	Skewed
	A	224	257.9	515.8
Naegeli et al 63	B	247	248.4	496.8	Skewed
	A	223.3	229.8	459.6
Wolters et al 51	B	810	4176	8352	Skewed
	A	318	1146	2292
Controlled studies
Dracup et al 15	I	257.4	20.40	40.8	Not skewed
	C	304.8	41.4	82.8
Luepker et al 31	I	130.2	8.25	16.5	Not skewed
	C	304.8	41.40	82.8
Sun et al 37	I	498	348	696	Skewed
	C	630	390	780

B-before A-after i-Intervention c- control