Age-standardised rates of smoking cessation among females aged 20–44 according to the two surveys
| Survey | Period | Age-standardised rates (per 100 person-years) | Person-years | Difference (95% CI) | Rate ratio (95% CI) | |
| Higher educated | Lower educated | |||||
| Older (1999–2000) | 1982–1984 | 1.62 | 1.15 | 19 942 | 0.47 (0.09 to 0.85) | 1.40 (1.08 to 1.82) |
| 1985–1987 | 2.35 | 1.66 | 21 044 | 0.69 (0.25 to 1.12) | 1.41 (1.15 to 1.74) | |
| 1988–1990 | 2.57 | 2.03 | 21 301 | 0.54 (0.10 to 0.98) | 1.27 (1.05 to 1.53) | |
| 1991–1993 | 2.28 | 1.99 | 20 552 | 0.29 (−0.13 to 0.71) | 1.15 (0.94 to 1.39) | |
| 1994–1996 | 2.36 | 1.95 | 19 640 | 0.41 (−0.02 to 0.83) | 1.21 (0.99 to 1.47) | |
| Recent (2004–2005) | 1982–1984 | 1.63 | 1.28 | 17 654 | 0.36 (−0.06 to 0.78) | 1.28 (0.97 to 1.69) |
| 1985–1987 | 2.20 | 1.30 | 18 938 | 0.90 (0.47 to 1.33) | 1.69 (1.33 to 2.14) | |
| 1988–1990 | 2.51 | 1.56 | 19 321 | 0.95 (0.50 to 1.40) | 1.61 (1.30 to 1.99) | |
| 1991–1993 | 1.84 | 1.55 | 19 035 | 0.29 (−0.10 to 0.69) | 1.19 (0.95 to 1.50) | |
| 1994–1996 | 1.64 | 1.49 | 18 774 | 0.15 (−0.22 to 0.51) | 1.10 (0.87 to 1.39) | |
| 1997–1999 | 2.36 | 1.81 | 17 508 | 0.55 (0.11 to 0.98) | 1.30 (1.06 to 1.60) | |
| 2000–2002 | 4.11 | 3.11 | 16 131 | 1.00 (0.39 to 1.61) | 1.32 (1.11 to 1.57) | |
| 1982–2002* | 2.34 | 1.66 | 127 361 | 0.68 (0.58 to 0.84) | 1.41 (1.30 to 1.53) | |
*Estimates of smoking cessation rates for the period 1982–2002 are based on the most recent survey.