Table 1.
Model input | Distribution | Mean/base case | SE | Parameter 1a | Parameter 2a | Source/notes |
---|---|---|---|---|---|---|
RR all-cause mortality, chronic alcohol misuser, male | LogNormal | 1.56 | 0.270 | 0.445 | 0.270 | Rehm et al. [31] used to calculate LT mortality (transition set b) |
RR all-cause mortality, chronic alcohol misuser, female | LogNormal | 2.26 | 0.342 | 0.815 | 0.342 | Rehm et al. [31] used to calculate LT mortality (transition set b) |
Prevalence alcohol misuse, male | Constant | 6 % | – | – | – | Drummond et al. [32] Input to calculate LT mortality (transition set b) |
Prevalence alcohol misuse, female | Constant | 2 % | – | – | – | Drummond et al. [32] Input to calculate LT mortality (transition set b) |
Acute mortality among patients with WKS | Beta | 10.6 % | 1.9 % | 26 | 245 | Input to transition ab |
Prevalence of WKS in chronic alcohol misusers attending the ED | Scaled beta | 19.0 % | 21.72 % | 2.359 | 1.865 | Range: 5, 30 Source: expert elicitation Input to transition set ab |
Proportion of patients presenting at an ED developing KS, no thiamine | Beta | 84.4 % | 2.65 % | 157 | 29 | Victor et al. [16] Input to transition set cb |
Proportion of patients with KS admitted to long-term care | Beta | 26.0 % | 4.28 % | 27 | 77 | Victor et al. [16] Input to transition set cb |
Probability of recovery from KS and discharge to community care or community | (see Electronic Supplementary Material 5) | Parameter set d | ||||
Probability of re-attendance at an ED once discharged | Uniform | 31.6 % | – | 10 % | 50 % | Assumption based on Pirmohamed et al. 2000 [35] Transition set eb |
Relative risk of development of KS, 10 days of treatment vs 0 | Normal | 0.050 | 0.013 | 0.050 | 0.013 | Elicitation panelc |
9 days vs 0 | Normal | 0.054 | 0.016 | 0.054 | 0.016 | Elicitation panelc |
8 days vs 0 | Normal | 0.058 | 0.019 | 0.058 | 0.019 | Elicitation panelc |
7 days vs 0 | Normal | 0.061 | 0.022 | 0.061 | 0.022 | Elicitation panelc |
6 days vs 0 | Normal | 0.065 | 0.025 | 0.065 | 0.025 | Elicitation panelc |
5 days vs 0 | Normal | 0.069 | 0.028 | 0.069 | 0.028 | Elicitation panelc |
4 days vs 0 | Normal | 0.281 | 0.073 | 0.281 | 0.073 | Elicitation panelc |
3 days vs 0 | Normal | 0.493 | 0.119 | 0.493 | 0.119 | Elicitation panelc |
2 days vs 0 | Normal | 0.705 | 0.165 | 0.705 | 0.165 | Elicitation panelc |
1 day vs 0 | Normal | 0.852 | 0.148 | 0.852 | 0.148 | Elicitation panelc |
Cost of ED attendance (GBP) | Gamma | 115 | 28.20 | 16.4681 | 6.9489 | NHS Reference Costs 2013 [37] |
Cost of long-term institutional care, per 3 months (GBP) | Uniform | 10,608 | – | 8000 | 12,000 | PSSRU [36] |
Cost of community care per 3 months (GBP) | Uniform | 5941 | – | 2500 | 6500 | PSSRU [36] |
Cost of inpatient bed-day (GBP) | Gamma | 279 | 43.03 | 42.0417 | 6.6363 | NHS Reference Costs 2013 [37]d |
Thiamine preparation, per pair of ampoules | Constant | GBP1.96 | – | BNF 67 [40]e | ||
Multivitamins, per day | Constant | GBP0.054 | – | BNF 67 [40]f | ||
Magnesium supplement, per day | Constant | GBP1.10 | – | BNF 67 [40]g | ||
IV giving set | Constant | GBP1.95 | – | Representative costh | ||
Saline 1 L | Constant | GBP0.97 | – | BNF 67 [40]i | ||
IV catheter | Constant | GBP1.80 | – | Representative costj |
BNF British National Formulary, ED emergency department, IV intravenous, KS Korsakoff’s syndrome, LT long-term, PSSRU Personal Social Services Research Unit, RR relative risk, SE standard error, WKS Wernicke–Korsakoff syndrome
aParameters for each distribution are as follows: normal- mean, standard error; beta- successes, failures; scaled beta- as for beta, with range for distribution reported in source/notes column; gamma- shape, scale; lognormal- natural log of mean, standard error of natural log of mean; uniform- lower and upper bounds
bTransition as per Fig. 1
cSee Electronic Supplementary File 3 for further details of the elicitation panel
dBased on mean of elective inpatient general surgery excess bed-day costs
ePabrinex® IV, GBP1.96 per pair of ampoules
fMultivitamin capsules, GBP1.50 per 28-capsule pack
gNon-proprietary magnesium maximum dose 160 mmol IV over 5 days
h http://www.dsmedical.co.uk/iv_giving_set
iNon-proprietary 1 L saline
jVenflon, www.vivomed.com