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. 2006 Jun;15(Suppl 3):iii12–iii18. doi: 10.1136/tc.2005.013870

Table 4 Retention and replenishment at waves 2 and 3.

Country Cohort Wave 1 Wave 2 Wave 3
n n Retained n Retained
Canada Wave 1 2214 1679 75.8% 1201 54.2%
Wave 2 NA 517 NA 362 70.0%
Wave 3 NA NA NA 543 NA
Total 2214 2196 NA 2106 NA
USA Wave 1 2138 1342 62.8% 799 37.4%
Wave 2 NA 684 NA 399 58.3%
Wave 3 NA NA NA 889 NA
Total 2138 2026 NA 2087 NA
UK Wave 1 2401 1865 77.7% 1328 55.3%
Wave 2 NA 255 NA 166 65.1%
Wave 3 NA NA NA 586 NA
Total 2401 2120 NA 2080 NA
Australia Wave 1 2305 1876 81.4% 1377 59.7%
Wave 2 NA 258 NA 194 75.2%
Wave 3 NA NA NA 532 NA
Total 2305 2134 NA 2103 NA

NA, not applicable.