Table 1.

Model input parameters: probabilities, utilities and costs

Parameter	Base case value	Lower limit	Upper limit	Distribution	Source	IRIS trial base value*
Probabilities
Proportion of women experiencing abuse	0.17	0.147	0.194	Beta	17	0.17
Starting distribution for women who are abused
Abused and identified, seeing advocate educator	0.003†	0	0.0066	Uniform	‡	–
Abused and identified, not seeing advocate educator	0.033†	0	0.0660	Uniform	‡	–
Abused but not identified	0.964†	–	–	Uniform	Complement	–
Transition probabilities
Not abused to abused but not identified	0.0037†	0.0004	0.0106	Dirichlet	‡	0.0075
Not abused to dead	0.00551†	0.0010	0.0136	Dirichlet	13 15	0.0058
Stay in Not abused	0.9908†	-	-	Dirichlet	Complement	0.9867
Abused but not identified to not abused (control)	0.0500†	0.0450	0.0553	Dirichlet	‡	0.025
Abused but not identified to abused and identified, not seeing advocate educator (control)	0.0027†	0.0016	0.0040	Dirichlet	IRIS-programme local sites	0.0094
Abused but not identified to abused and identified, seeing advocate educator (control)	0.0005†	0.0001	0.0011	Dirichlet	IRIS-programme local sites	0.0016
Abused but not identified to dead (control)	0.00554†	0.0039	0.0074	Dirichlet	13 15	0.0059
Stay in abused but not identified (control)	0.9444†	-	-	Dirichlet	Complement	0.9581
Abused but not identified to not abused (intervention)	0.0500†	0.0450	0.0553	Dirichlet	‡	0.025
Abused but not identified to abused and identified, not seeing advocate educator (intervention)	0.0109†	0.0086	0.0135	Dirichlet	IRIS-programme local sites	0.0207
Abused but not identified to abused and identified, seeing advocate educator (intervention)	0.0056†	0.0040	0.0076	Dirichlet	IRIS-programme local sites	0.0101
Abused but not identified to dead (intervention)	0.00554†	0.0039	0.0074	Dirichlet	6	0.0059
Stay in abused but not identified (intervention)	0.9419†	-	-	Dirichlet	Complement	0.9383
Abused and identified, seeing advocate educator to not abused	0.1408†	0.0707	0.2301	Dirichlet	18	0.0888
Abused and identified, seeing advocate educator to dead	0.00554†	0.0000	0.0309	Dirichlet	13 15	0.0059
Stay in abused and identified, seeing advocate educator	0.8536†	-	-	Dirichlet	Complement	0.9053
Abused and identified, not seeing advocate educator to not abused	0.0781†	0.0136	0.1912	Dirichlet	18	0.0717
Abused and identified, not seeing advocate educator to dead	0.00554†	0.0000	0.0438	Dirichlet	13 15	0.0059
Stay in abused and identified, not seeing advocate educator	0.9163†	-	-	Dirichlet	Complement	0.9223
Utilities
Not abused	0.85	0.840	0.860	Beta	23	–
Abused but not identified	0.63	0.503	0.749	Beta	24	–
Abused and identified, seeing advocate educator	0.65	0.518	0.771	Beta	24	–
Abused and identified, not seeing advocate educator	0.63	0.503	0.749	Beta	24	–
Costs
Costs of the intervention, per women registered, per 6 months	£0.46†	£0.01	£1.69	Gamma	IRIS-programme local sites	£0.55
Cost of onward referral, once	£312†	£8	£1127	Gamma	IRIS-programme local sites & 11	£298
Cost of abused but not identified	£2043	£52	£7536	Gamma	8	£4721
Weighted costs abused and identified, seeing advocate educator	1	0.75	1.25	Gamma	Assumption	–
Weighted costs abused and identified, not seeing advocate educator	1	0.9	1.1	Gamma	Assumption	–

Costs are in 2015/2016 UK£.

*Values obtained from Devine et al.¹¹

†Value updated from Devine et al.¹¹

‡Internal calculation based on model calibration.