Table 2.
Urine morphine test results at different entrant years and following months (n=293)
| Year | Positive percentage of urine morphine tests by month (%, n/N) | Median (IQR) | |||||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | ||
| 2006 | 97.1 (34/35) | 48.6 (17/35) | 45.7 (16/35) | 37.1 (13/35) | 60.0 (21/35) | 45.7 (16/35) | 54.3 (19/35) | 48.6 (17/35) | 54.3 (19/35) | 60.0 (21/35) | 37.5 (12/32) | 46.9 (15/32) | 48.6 (45.7–58.6) |
| 2007 | 92.3 (72/78) | 55.1 (43/78) | 50.0 (39/78) | 43.6 (34/78) | 47.4 (37/78) | 51.3 (40/78) | 50.0 (39/78) | 42.3 (33/78) | 50.0 (39/78) | 46.2 (36/78) | 44.4 (32/72) | 44.3 (31/70) | 48.7 (44.3–51.0) |
| 2008 | 96.6 (56/58) | 50.0 (29/58) | 46.6 (27/58) | 48.3 (28/58) | 51.7 (30/58) | 41.4 (24/58) | 34.5 (20/58) | 39.7 (23/58) | 39.7 (23/58) | 39.7 (23/58) | 39.7 (23/58) | 49.1 (28/57) | 44.0 (39.7–49.8) |
| 2009 | 97.7 (42/43) | 62.8 (27/43) | 41.9 (18/43) | 41.9 (18/43) | 58.1 (25/43) | 39.5 (17/43) | 44.2 (19/43) | 27.9 (12/43) | 37.2 (12/43) | 37.2 (16/43) | 40.5 (17/42) | 31.7 (13/41) | 41.2 (37.2–54.6) |
| 2010 | 96.7 (29/30) | 50.0 (15/30) | 53.3 (16/30) | 50.0 (15/30) | 40.0 (12/30) | 40.0 (12/30) | 43.3 (13/30) | 43.3 (13/30) | 46.7 (14/30) | 40.0 (12/30) | 35.7 (10/28) | 37.0 (10/27) | 43.3 (40.0–50.0) |
| 2011 | 100.0 (38/38) | 55.3 (21/38) | 47.4 (18/38) | 42.1 (16/38) | 39.5 (15/38) | 42.1 (16/38) | 57.9 (22/38) | 44.7 (17/38) | 44.7 (17/38) | 42.1 (16/38) | 36.4 (12/33) | 41.9 (13/31) | 43.4 (42.0–53.3) |
| 2012 | 90.0 (10/11) |
45.5 (5/11) |
9.1 (1/11) |
9.1 (1/11) |
27.3 (3/11) |
27.3 (3/11) |
18.2 (2/11) |
27.3 (3/11) |
9.1 (1/11) |
18.2 (2/11) |
20.0 (2/10) |
25.0 (2/8) |
22.5 (11.4–27.3) |
| Total | 95.9 (281/293) | 53.6 (157/293) | 46.1 (135/293) | 42.7 (125/293) | 48.8 (143/293) | 43.7 (128/293) | 45.7 (134/293) | 40.3 (118/293) | 42.7 (125/293) | 43.0 (126/293) | 39.3 (108/275) | 42.1 (112/266) | 43.4 (40.0–51.0) |