Effectiveness of gastric cancer screening programs in South Korea: Organized vs opportunistic models

Table 1 Demographics of participants n (%)

	National Cancer Screening Program	Opportunistic screening	P value
No. of subjects	34  416 (75.4)	11  238 (24.6)
Age (yr), mean ± SD	56.2 ± 9.2	50.0 ± 8.0	< 0.001
40-49	8723 (25.4)	6159 (54.8)
50-59	12  491 (36.3)	3623 (32.2)
60-69	10  645 (30.9)	1165 (10.4)
70+	2557 (7.4)	291 (2.6)
Sex			< 0.001
Male	11  987 (34.8)	6668 (59.3)
Female	22  429 (65.2)	4570 (40.7)
No. of regular follow-up	6585 (19.1)	3050 (27.1)	< 0.001
Gastric cancer	100 (0.3)	26 (0.2)	0.299
Endoscopic feature			0.046
EGC	74 (74.0)	14 (53.8)
AGC	26 (26.0)	12(46.2)

EGC: Early gastric cancer; AGC: Advanced gastric cancer.

Table 2 Outcomes according to compliance to screening systems n (%)

	Regular follow-up	Irregular follow-up	P value
No. of subjects	9635 (21.1)	36  019 (78.9)
Age (yr), mean ± SD	54.4 ± 9.3	55.7 ± 9.1	< 0.001
40-49	2783 (28.9)	12  099 (33.6)
50-59	3413 (35.4)	12  701 (35.2)
60-69	2789 (28.9)	9021 (25.1)
70+	650 (6.8)	2198 (6.1)
Sex			< 0.001
Male	4170 (43.3)	14  485 (40.2)
Female	5465 (56.7)	21  534 (59.8)
Gastric cancer	17 (0.2)	109 (0.3)	0.036
Endoscopic feature			0.942
EGC	12 (70.6)	76 (69.7)
AGC	5 (29.4)	33 (30.3)

EGC: Early gastric cancer; AGC: Advanced gastric cancer.