USDT model

Name: USDT

Description: Framework for a 4-stage cascade model, without vital dynamics or new cases

Compartments

Compartment: Undiagnosed

  • Code name: undx

  • Does not appear in the databook

  • Description:

  • Data entry guidance:

Compartment: Screened

  • Code name: scr

  • Does not appear in the databook

  • Description:

  • Data entry guidance:

Compartment: Diagnosed

  • Code name: dx

  • Does not appear in the databook

  • Description:

  • Data entry guidance:

Compartment: Treated

  • Code name: tx

  • Does not appear in the databook

  • Description:

  • Data entry guidance:

Characteristics

Characteristic: All people with condition

  • Code name: all_people

  • Value can be used for calibration

  • Includes:

    • Undiagnosed

    • Screened

    • Diagnosed

    • Treated

  • Appears in the databook

  • Databook values will be used for model initialization

  • Description:

  • Data entry guidance:

Characteristic: Screened people

  • Code name: all_screened

  • Value can be used for calibration

  • Includes:

    • Screened

    • Diagnosed

    • Treated

  • Appears in the databook

  • Databook values will be used for model initialization

  • Description:

  • Data entry guidance:

Characteristic: Diagnosed people

  • Code name: all_dx

  • Value can be used for calibration

  • Includes:

    • Diagnosed

    • Treated

  • Appears in the databook

  • Databook values will be used for model initialization

  • Description:

  • Data entry guidance:

Characteristic: Currently treated

  • Code name: all_tx

  • Value can be used for calibration

  • Includes:

    • Treated

  • Appears in the databook

  • Databook values will be used for model initialization

  • Description:

  • Data entry guidance:

Parameters

Parameter: Annual number screened

  • Code name: num_screen

  • Units/format: number

  • Value restrictions: At least 0

  • Default value: None

  • Appears in the databook

  • Used to compute:

    • “Screening rate”

  • Description:

  • Data entry guidance:

Parameter: Screening rate

  • Code name: screen

  • Value can be used for calibration

  • Units/format: probability

  • Value restrictions: 0-1.0000

  • Contributes to transitions from:

    • “Undiagnosed” to “Screened”

  • Default value: None

  • Does not appear in the databook

  • This parameter’s value is computed by a function: num_screen/max(undx,num_screen)

  • Depends on:

    • “Annual number screened”

    • “Undiagnosed”

  • Description:

  • Data entry guidance:

Parameter: Annual number of new diagnoses

  • Code name: num_diag

  • Units/format: number

  • Value restrictions: At least 0

  • Default value: None

  • Appears in the databook

  • Used to compute:

    • “Diagnosis rate”

  • Description:

  • Data entry guidance:

Parameter: Diagnosis rate

  • Code name: diag

  • Value can be used for calibration

  • Units/format: probability

  • Value restrictions: 0-1.0000

  • Contributes to transitions from:

    • “Screened” to “Diagnosed”

  • Default value: None

  • Does not appear in the databook

  • This parameter’s value is computed by a function: num_diag/max(scr,num_diag)

  • Depends on:

    • “Screened”

    • “Annual number of new diagnoses”

  • Description:

  • Data entry guidance:

Parameter: Annual number newly initiated onto treatment

  • Code name: num_initiate

  • Units/format: number

  • Value restrictions: At least 0

  • Default value: None

  • Appears in the databook

  • Used to compute:

    • “Initiation rate”

  • Description:

  • Data entry guidance:

Parameter: Initiation rate

  • Code name: initiate

  • Value can be used for calibration

  • Units/format: probability

  • Value restrictions: 0-1.0000

  • Contributes to transitions from:

    • “Diagnosed” to “Treated”

  • Default value: None

  • Does not appear in the databook

  • This parameter’s value is computed by a function: num_initiate/max(dx,num_initiate)

  • Depends on:

    • “Diagnosed”

    • “Annual number newly initiated onto treatment”

  • Description:

  • Data entry guidance:

Parameter: Annual number lost to follow-up

  • Code name: num_loss

  • Units/format: number

  • Value restrictions: At least 0

  • Default value: None

  • Appears in the databook

  • Used to compute:

    • “Loss-to-follow-up rate”

  • Description:

  • Data entry guidance:

Parameter: Loss-to-follow-up rate

  • Code name: loss

  • Value can be used for calibration

  • Units/format: probability

  • Value restrictions: 0-1.0000

  • Contributes to transitions from:

    • “Treated” to “Diagnosed”

  • Default value: None

  • Does not appear in the databook

  • This parameter’s value is computed by a function: num_loss/max(tx,num_loss)

  • Depends on:

    • “Treated”

    • “Annual number lost to follow-up”

  • Description:

  • Data entry guidance:

Interactions

Cascades

Cascade: main

  • Description:

  • Stages:

    • All people with condition

      • All people with condition

    • Screened

      • Screened people

    • Diagnosed

      • Diagnosed people

    • Currently treated

      • Currently treated