Input parameters to simulation model in baseline scenario
| Parameter | Resources | Value in baseline scenario | Distribution type | Data sources |
|---|---|---|---|---|
| Referral rate | 100 patients/month | Poisson | Expert opinion | |
| Group induction (one group session per week) | Nurse Physician Surgeon | Up to 20 patients/week | Existing data | |
| Following group induction | ||||
| Patient assessment | 93% | Bernoulli | Existing | |
| Do not continue | 7% | Bernoulli | Data | |
| Patient assessment (once a week) | Nurse | Up to 20 patients/week | ||
| Following patient assessment | ||||
| Lifestyle clinic | 5% | Bernoulli | Existing | |
| Pharmacotherapy clinic | 16% | Bernoulli | Data | |
| Eligibility for surgery clinic | 79% | Bernoulli | ||
| Lifestyle clinic (two group sessions per week) | Dietician | Up to 8 patients/week | Existing data | |
| Six separate appointments/patient | ||||
| Time period between appointments | 20 working days (1 month) | Triangular | Expert opinion | |
| Pharmacotherapy clinic (once a week) | Physician | Up to 14 patients/ week | Existing data | |
| Following Pharmacotherapy | Expert | |||
| Receive drugs (drug A) | 84% success rate | Bernoulli | opinion | |
| Receive drug B (if drug A fails) | 80% success rate | Bernoulli | ||
| Time period for second appointment | 90 days (3 months) | Triangular | ||
| Time period for third appointment | 120 days (6 months) | Triangular | ||
| If drugs A and B fail, | Expert | |||
| Referral to surgery | 15% | Bernoulli | Opinion | |
| Referral to lifestyle clinic | 10% | Bernoulli | ||
| Discharged | 75% | Bernoulli | ||
| Eligibility clinic (outpatients) | Physician Psychiatrist | Up to 10 patients/week | Existing data | |
| Following Eligibility clinic | Existing | |||
| Decision clinic (surgery) | 60% | Data | ||
| Psychiatric review | 30% | |||
| DNA surgery | 10% | |||
| Decision (for surgery) clinic | Surgeon Dietician | 8 patients/week | Existing data | |
| Preassessment clinic (2 weeks before the scheduled operation) | Anaesthetist Nurse | 8 patients/week | Existing data | |
| Operations (three types of surgical procedures) | Surgeon Anaesthetist | 3 half day theatre lists/week | Existing data | |
| Gastric band (1 h procedure) | 19% | Bernoulli | ||
| Sleeve gastrectomy (1.5 h) | 22% | Bernoulli | ||
| Gastric bypass (2 h) | 59% | Bernoulli | ||
| Postoperative length of stay following | Beds | Depending on type of surgery | Expert opinion | |
| Gastric band | 1 day | |||
| Sleeve gastrectomy | 2 days | |||
| Gastric bypass | 2 days | |||