Table 6.
Summary of the cost‐effectiveness results from the multiple imputation analysis versus completed case analysis.
| Multiple imputation analysis | Complete case analysis | |||
|---|---|---|---|---|
| Intervention group (n = 2635) | Control group (n = 1748) | Intervention group (n = 1667) | Control group (n = 1108) | |
| Adjusted total cost (mean, SD) | £760 (£2039) | £669 (£2059) | £851 (£2455) | £724 (£2465) |
| Cost difference (£) (95% CI) | £92 (−£32 to £216) | £127 (−£60 to £314) | ||
| Adjusted QALY at 6 months | 0.382 (0.046) | 0.380 (0.046) | 0.384 (0.052) | 0.382 (0.053) |
| QALY difference (95% CI) (mean, SD) | 0.002 (−0.001 to 0.004) | 0.003 (−0.044 to 0.055) | ||
| ICER (cost per QALY gained) (95% CI) | £59 401 (−£604 833 to £644 486) | £49 842 (−£425 064 to £536 813) | ||
| Intervention cost (mean, SD) | £54 (£12) | £0.9 (£1) | £55 (£13) | £0.9 (£2) |
| Attendance at SSS (n, %) | 458 (17.4%) | 158 (9.0%) | 334 (20.0%) | 102 (9.2%) |
| ICER (cost per additional attendee NHS SSS) (95% CI) | £627 (£620 to £634) | £498 (£491 to £504) | ||
| Validated 7‐day abstinence at 6 months | 236 (8.96%) | 97 (5.55%) | 214 (12.84%) | 87 (7.85%) |
| ICER (cost per additional quitter) (95% CI) | £2689 (−£952 to £6329) | £2552 (−£1199 to £6303) | ||
QALY = quality‐adjusted life‐years; SD = standard deviation; ICER = incremental cost‐effectiveness ratios; CI = confidence interval.