Table 1.

Prevalence of PDA Diagnosis, surgical ligation, and pharmacological intervention according to the birth weight group.

		2015	2016	2017	2018	Total
Diagnosis of PDA	Number	3,060	3,006	3,213	3,057	12,336
	Total (%)	0.7	0.74	0.9	0.94	0.81
	Preterm (%)	5.69	5.77	6.74	6.74	6.2
	Term (%)	0.33	0.35	0.42	0.45	0.38
	> 2500 g (%)	0.31	0.33	0.4	0.43	0.36
	1500-2500 g (%)	2.27	2.50	3.40	3.32	2.84
	VLBW (%)	41.69	43.69	48.3	47.25	45.02
Surgical treatment of PDA	Number	671	662	621	568	2,521
	Total (%)	21.93	22.02	19.33	18.58	20.44
	> 2500 g (%)	26.37	25.81	20.78	19.01	22.95
	1500-2500 g (%)	12.33	13.28	10.56	8.14	10.95
	VLBW (%)	19.07	21.88	22.50	23.44	21.67
Medical Treatment of PDA	Number	1,182	1,114	995	911	4,202
	Total (%)	38.63	37.06	30.97	29.80	34.06
	> 2500 g (%)	17.71	14.81	10.17	12.09	13.66
	1500-2500 g (%)	34.00	31.31	25.64	24.24	28.43
	VLBW (%)	61.87	62.66	56.46	52.86	58.57

Abbreviations: PDA, patent ductus arteriosus; VLBW, very low birth weight.

(% value is calculated from denominator of total birth in the relevant year).