Table 3. Baseline characteristics of study population in 4 RCTs for meta-analysis.

Study	Age[median(years), range]	EHS	IIEF	Diabetes	Hypertension	Heart disease	Smoking	Alcohol	Lipids
Vardi 2012 (10)	58 (27-72) vs. 57 (35-77)#	≤2	IIEF-EF < 19	30 vs. 30%#	ND	20 vs. 10%#	ND	NA	ND
Olsen 2014 (17)	59 (41 80) vs. 60(37–79)	<2	IIEF-EF < 20	18 vs. 13%#	33 vs. 37%#	4 vs. 11%#	ND	ND	NA
Srini 2015 (25)	NA	≤2	IIEF-EF < 18	ND	22.11 vs. 5% (p=0.0219)	3.16 vs. 25% (p=0.0003)	ND	23.16 vs. 47.5% (p=0.0074)	20 vs. 47.5% (p=0.0017)
Kitrey 2016 (28)	60 (28-78) vs. 64 (29-81)#	≤2	IIEF-EF ≤ 12	56.8 vs. 72.2%#	ND	48.6 vs. 38.9%#	ND	NA	ND

The former is a LI-ESWT group and the latter is a controlled group in the blank. #: No significant differences between groups. ND: no significant differences. NA: not applicable.