Table 3. Comparison of characteristics between the improved and non-improved groups.

Characteristics	Total	Improved (n=21)	Non-improved (n=9)	p
Sex				>0.999*
Male	10	7	3
Female	20	14	5
Age (years)	34.5±12.1	34.6±11.4	34.2±14.3	0.9436
Device size (mm)	22.3±4.9	23.7±4.8	19.0±3.5	0.0140
Qp/Qs	2.1 (1.8-2.3)	1.9 (1.7-2.2)	2.2 (2.0-2.4)	0.0932
RVP (mmHg)	32 (30-40)	31 (30-40)	35 (31-45)	0.3132

Values are presented as mean±standard deviation. ^*The p value is from Fisher's exact test. Qp/Qs: ratio of pulmonary to systemic flow