Table 1 Summary of parameters used for depression progression, screening and case-finding
Parameters | Value | Source |
|---|---|---|
Incidence of depression (per year) in patients with diabetes and no history of depression | ||
 Minor | 5.4% | Assumption |
 Major | 5.4% | Nefs et al. [20] |
Time to progression (years) | ||
 Minor to major depression | 42% at 2 years | Bot et al. [19] |
Time to relapse of depression for patients with a history of depression (years) | ||
 Minor | 1.359 | Assumption |
 Major | 1.359 | Lutsman et al. [21] |
Time to spontaneous recovery (years) | ||
 Minor | 0.354 | NICE CG90 [24] |
 Major | 0.877 | Spijker et al. (2002) [38] |
Average annual number of GP appointments (other than appointments associated with depression treatment) | Â | Â |
 • cigDiabetes, no depression  • Diabetes with minor depression  • Diabetes with major depression | 12.5 8 8 | Bhattarai et al. [22] Assumption Assumption |
Probability that a GP appointment includes a depression screen | Â | Â |
 • No history of depression  • History of depression | 5% 20% | Assumption |
Probability of attending annual diabetes review | Â | QOF 2012/13 [39] DM29 |
 • No depression  • Minor depression  • Major depression | 90.4% RRa: 0.9 RRa: 0.65 | Assumption Assumption |
Probability that the annual review includes a depression screen | 85.9% | QOF 2012/13 [39] DEP1 |
Effectiveness of screening | Â | Â |
 • Sensitivity of Whooley questions  • Specificity of Whooley questions  • Sensitivity of structured interview  • Specificity of structured interview | 95% 66% 100% 100% | NICE CG91 [11] NICE CG91 [11] Assumption Assumption |