Table 1.
Q1 2005 | Q1 2006 | Q2 2006 | Q3 2006 | Q4 2006 | Q1 2007 | Q2 2007 | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SP | SP | NGC | SP | NGC | SP | NGC | SP | NGC | SP | NGC | SP | NGC | |
Intervention | 33% | 58% | 29% | 59% | 30% | 62% | 30% | 62% | 4% | 67% | 19% | 69% | 14% |
Control | 25% | 33% | 35% | 32% | 35% | 32% | 36% | 32% | 9% | 38% | 25% | 43% | 25% |