TABLE 1.
Two-Slope Regression Model
| Age Group | Plan | Preinflection % Decline/Year (95% CI) | Inflection Year | Postinflection % Decline/Year (95% CI) |
|---|---|---|---|---|
| 3 to <24 mo | ||||
| A | 5.0 (4.7 to 5.3) | 2004–2005 | 2.4 (2.1 to 2.6) | |
| B | 9.3 (8.6 to 10) | 2003–2004 | 2.1 (1.7 to 2.5) | |
| C | 7.2 (6.8 to 7.5) | 2003–2004 | 0.5 (0.3 to 0.7) | |
| 2 to <4 y | ||||
| A | 7.2 (5.9 to 8.5) | 2001–2002 | 2.8 (2.6 to 2.9) | |
| B | 4.4 (4.1 to 4.7) | 2008–2009 | –2.9 (–5.8 to –0.1) | |
| C | 7.1 (6.6 to 7.5) | 2003–2004 | 0.3 (0.1 to 0.6) | |
| 4 to <6 y | ||||
| A | 4.6 (4.3 to 5.0) | 2004–2005 | 1.7 (1.4 to 2.0) | |
| B | 4.3 (3.9 to 4.7) | 2006–2007 | 2.3 (1.3 to 3.2) | |
| C | 5.8 (5.3 to 6.4) | 2003–2004 | 0.3 (0.1 to 0.6) | |
| 6 to <12 y | ||||
| A | 4.2 (4.0 to 4.5) | 2004–2005 | 0.9 (0.7 to 1.1) | |
| B | 5.4 (3.5 to 7.3) | 2001–2002 | 2.7 (2.5 to 2.9) | |
| C | 7.1 (6.7 to 7.4) | 2003–2004 | –0.7 (–0.9 to –0.5) | |
| 12 to <18 y | ||||
| A | 1.7 (1.5 to 1.8) | 2007–2008 | –0.3 (–0.8 to 0.2)a | |
| B | 6.7 (5.0 to 8.4) | 2001–2002 | –0.1 (–0.2 to 0.1)a | |
| C | 4.9 (4.6 to 5.3) | 2003–2004 | –1.1 (–1.3 to –1.0) |
Decline in total antibiotic rate before inflection year compared with decline noted after inflection. Negative percentages indicate an increase in antibiotic prescribing rate during this time period.
a
For CIs that include 0, a decline of 0 is consistent with a stable rate of dispensing.