Table 3.1: Dropout among patients in methadone treatment during 3 years of following-up in Haiphong, Vietnam (2012 - 2014) Phòng khám 0 - 12 months 13 - 24 months 25 - 36 months Total dropped out over 3 years Patients initially enrolled Missed > 5 consecuti ve days n (%) Dropped out n (%) Patients initially enrolled Missed > 5 consecuti ve days n (%) Dropped out n (%) Patients initially enrolled Missed > 5 consecuti ve days n (%) Dropped out n (%) An Duong 244 13 (5.3) 15 (6.2) 229 8 (3.5) 30 (13.1) 198 20 (10.1) 33 (16.7) 79 (32.4) An Lao 184 1 (0.5) 32 (17.4) 152 2 (1.3) 24 (15.8) 128 7 (5.5) 25 (19.5) 81 (44.0) Hai An 207 11 (5.3) 27 (13.0) 180 4 (2.2) 29 (16.1) 151 15 (9.9) 21 (13.9) 77 (37, 2) Hong Bang 167 1 (0, .6 11 (6.6) 156 5 (3.2) 12 (7.7) 144 11 (7.6) 15 (10.4) 38 (22.8) Kien An 253 6 (2.4) 26 (10.3) 227 13 (5.7) 29 (12.8) 198 15 (7.6) 21 (10.6) 76 (30.0) Total 1055 32 (3.0) 111 (10.5) 944 32 (3.4) 124 (13.1) 819 68 (8.3) 115 (14.0) 351 (33.3) Comments: The proportion of patients who had abandoned methadone was 10.5% during the first year, 13.2% during the second year and 14.0% during the third year.