Percentage of respondents making a quit attempt by quarter for 2007 and 2008
| Quarter | 2007 % of quitters (95% CI; n/N) | 2008 % of quitters (95% CI; n/N) | Fisher's exact test (two-sided) |
| 1st (January–March) | 10.2 (9.4 to 11.0; 191/1866) | 7.8 (6.9 to 8.7; 98/1255) | p=0.023 |
| 2nd (April–June) | 7.2 (6.5 to 7.9; 98/1360) | 7.2 (6.4 to 8.1; 90/1247) | p=1.0 |
| 3rd (July–September) | 7.9 (7.2 to 8.7; 110/1393) | 5.9 (5.2 to 6.7; 75/1282) | p=0.039 |
| 4th (October–December/January) | 5.5 (4.9 to 6.1; 74/1339) | 6.7 (5.9 to 7.5; 55/817) | p=0.26 |