Table 4 Difference in estimated average number of months spent retained on buprenorphine between each of the four retention definitions

Retention 1

 ≥ 180 days of treatment without > 7-day gap

0

0.8 (0.3,1.4)

1.9 (1.2, 2.8)

3.1 (2.1, 4.2)

Retention 2

 ≥ 180 days of treatment without > 30-day gap

0

1.1 (0.4, 1.8)

2.3 (1.4, 3.2)

Retention 3

 ≥ 90 days of treatment without > 7-day gap

0

1.2 (0.5, 2.1)

Retention 4

 ≥ 90 days of treatment without > 30-day gap

0