Table 1 Baseline demographic characteristics and follow-up time of the repeat participants in the 2-year-round screening
|  | 2011–2014 (Round 1) | 2013–2016 (Round 2) | 2015–2018 (Round 3) | 2017–2020 (Round 4) | ||||
|---|---|---|---|---|---|---|---|---|
N (%) | Person-years | N (%) | Person-years | N (%) | Person-years | N (%) | Person-years | |
Total | 105,708(100) | 18,8883 | 341,562(100) | 629,622 | 404,184(100) | 769,964 | 284,528(100) | 550,064 |
Gender | ||||||||
Male | 41,994 (39.7) | 74,040 | 134,460 (39.4) | 246,024 | 169,284 (41.9) | 321,875 | 121,449 (42.7) | 233,596 |
Female | 63,714 (60.3) | 114,843 | 207,102 (60.6) | 383,598 | 234,900 (58.1) | 448,088 | 163,079 (57.3) | 316,468 |
Age at the time of follow-up screening (year) | ||||||||
15–34 | 2,860 (2.7) | 5,187 | 6,790 (2.0) | 13,116 | 5,121 (1.3) | 9,995 | 1,215 (0.4) | 2,443 |
35–44 | 8,316 (7.9) | 15,174 | 15,501 (4.5) | 30,114 | 10,598 (2.6) | 20,664 | 3,504 (1.2) | 6,969 |
45–54 | 20,172 (19.1) | 36,809 | 59,212 (17.3) | 116,641 | 49,291 (12.2) | 94,021 | 21,009 (7.4) | 40,417 |
55–64 | 34,328 (32.5) | 60,859 | 113,017 (33.1) | 213,111 | 119,214 (29.5) | 222,630 | 68,604 (24.1) | 129,782 |
65–74 | 26,142 (24.7) | 46,647 | 101,894 (29.8) | 176,795 | 155,268 (38.4) | 299,196 | 132,698 (46.6) | 257,168 |
75+ | 13,890 (13.1) | 24,207 | 45,148 (13.2) | 79,845 | 64,692 (16.0) | 123,458 | 57,498 (20.2) | 113,285 |
Population density | ||||||||
High | 2,693 (2.5) | 4,265 | 103,017 (30.2) | 163,771 | 141,323 (35.0) | 252,830 | 138,532 (48.7) | 275,706 |
Low | 103,015 (97.5) | 184,618 | 238,545 (69.8) | 465,851 | 262,861 (65.0) | 517,134 | 145,996 (51.3) | 274,358 |
Gross domestic product per capita | ||||||||
High | 69,751 (66.0) | 135,969 | 143,204 (41.9) | 278,718 | 188,794 (46.7) | 353,494 | 73,410 (25.8) | 141,427 |
Low | 35,957 (34.0) | 52,914 | 198,358 (58.1) | 350,904 | 215,390 (52.3) | 416,470 | 211,118 (74.1) | 408,637 |
Prevalence | ||||||||
Low | 6,644 (6.3) | 10,706 | 35,536 (10.4) | 70,684 | 103,140 (25.5) | 170,723 | 127,152 (44.7) | 243,376 |
High | 99,064 (93.7) | 178,176 | 306,026 (89.6) | 558,938 | 301,044 (74.5) | 599,241 | 157,376 (55.3) | 306,688 |
Geographical location | ||||||||
Non-island area | 99,064 (93.7) | 178,176 | 319,518 (93.5) | 583,302 | 333,807 (82.6) | 660,575 | 196,949 (69.2) | 382,701 |
Island area | 6,644 (6.3) | 10,706 | 22,044 (6.5) | 46,320 | 70,377 (17.4) | 109,388 | 87,579 (30.8) | 167,363 |