Coronavirus Anxiety Scale

CAS

Sum five caller-assigned Lee 2020 Coronavirus Anxiety Scale integers (0-4) and return the published total (max 20) and ≥9 screen.

LIVE $0.005 USDC GET /api/calc/cas

Markdown: /docs/cas.md · Canonical: https://magentlab.com/docs/cas

Not a medical device. Not a diagnosis, dose, or listing recommendation.

What it computes

Sum five caller-assigned Lee 2020 Coronavirus Anxiety Scale integers (0-4) and return the published total (max 20) and ≥9 screen.

When to use

When an agent has already assigned Lee 2020 CAS 0-4 integers for each of the five items over the past two weeks and needs the published total and ≥9 screen, not a GAD-7 score, PHQ-9, or an anxiety diagnosis. magent does not interview the patient.

When not to use

Not a medical device and not a diagnosis or treatment order.
dizzy, sleep, paralyzed, appetite, and nausea are caller-assigned integers 0-4 for the past two weeks (0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day). magent does not interview the patient or interpret the items.
Lee 2020 published an optimized cut of ≥9 for probable dysfunctional coronavirus-related anxiety (90% sensitivity, 85% specificity in this paper). magent does not invent extra mild/moderate severity bands. screen_ge_9 is that published screen, not a diagnosis.
This is Lee 2020 CAS only (five items; max 20). The scale is public domain per the author; still cite Lee 2020. magent does not score GAD-7 or PHQ-9 here.

Formula

CAS = dizzy + sleep + paralyzed + appetite + nausea; each caller-assigned 0-4 (Lee 2020 / DSM-5 cross-cutting: 0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day); past two weeks; max 20; screen_ge_9 iff score ≥ 9

Citation

Title: Coronavirus Anxiety Scale: A brief mental health screener for COVID-19 related anxiety
Authors: Lee SA
Source: Death Studies. 2020;44(7):393-401
DOI: 10.1080/07481187.2020.1748481

Worked example

All items 0

Given: appetite=0dizzy=0nausea=0paralyzed=0sleep=0

dizzy 0 + sleep 0 + paralyzed 0 + appetite 0 + nausea 0
Score = 0 (max 20); screen_ge_9 false

Published ≥9 cut

Given: appetite=2dizzy=2nausea=1paralyzed=2sleep=2

dizzy 2 + sleep 2 + paralyzed 2 + appetite 2 + nausea 1
Score = 9 (max 20); screen_ge_9 true (threshold is ≥9)

All items 4

Given: appetite=4dizzy=4nausea=4paralyzed=4sleep=4

Score = 20 (max 20)
screen_ge_9 true

Also searched as

Coronavirus Anxiety Scale
CAS
Lee 2020 CAS
COVID-19 related anxiety scale
coronavirus anxiety screener
five-item coronavirus anxiety
Lee CAS score

Try

Opens the live endpoint. Unpaid browser requests show the paywall; agents should send Accept: application/json.

/api/calc/cas?dizzy=0&sleep=0&paralyzed=0&appetite=0&nausea=0

Full URL: https://api.magentlab.com/api/calc/cas?dizzy=0&sleep=0&paralyzed=0&appetite=0&nausea=0

Call

Expect HTTP 402 until you retry with PAYMENT-SIGNATURE. Incomplete query params return HTTP 400 before any quote or charge.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/calc/cas?dizzy=0&sleep=0&paralyzed=0&appetite=0&nausea=0"

Parameters

Name	Type	Required	Description
`dizzy`	integer	required	Caller-assigned Lee 2020 CAS item 1 (integer 0-4, past two weeks): I felt dizzy, lightheaded, or faint when I read or listened to news about the coronavirus (0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day). magent does not interview the patient.
`sleep`	integer	required	Caller-assigned Lee 2020 CAS item 2 (integer 0-4, past two weeks): I had trouble falling or staying asleep because I was thinking about the coronavirus (0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day). magent does not interview the patient.
`paralyzed`	integer	required	Caller-assigned Lee 2020 CAS item 3 (integer 0-4, past two weeks): I felt paralyzed or frozen when I thought about or was exposed to information about the coronavirus (0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day). magent does not interview the patient.
`appetite`	integer	required	Caller-assigned Lee 2020 CAS item 4 (integer 0-4, past two weeks): I lost interest in eating when I thought about or was exposed to information about the coronavirus (0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day). magent does not interview the patient.
`nausea`	integer	required	Caller-assigned Lee 2020 CAS item 5 (integer 0-4, past two weeks): I felt nauseous or had stomach problems when I thought about or was exposed to information about the coronavirus (0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day). magent does not interview the patient.

Bulk (POST)

POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement.

POST /api/calc/cas Max 25 unit_amount + extra_item_amount * (n - 1) extra $0.002 PREVIEW

1 to 25 items. Each item uses the same keys as the GET query parameters.
POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows.
The first invalid item fails the whole request (index in the 400 JSON). You are not charged.
HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row.
Catalog misses (empty matches, found=false) stay paid 200s inside that slot.
x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items.

Example request (fixture)

{
  "items": [
    {
      "appetite": "0",
      "dizzy": "0",
      "nausea": "0",
      "paralyzed": "0",
      "sleep": "0"
    },
    {
      "appetite": "0",
      "dizzy": "0",
      "nausea": "0",
      "paralyzed": "0",
      "sleep": "0"
    }
  ]
}

Open bulk paywall →

Opens a two-item fixture on the API host. Unpaid browsers get the same MetaMask paywall as GET; Pay retries POST with those items.

Example 200 (fixture)

{
  "count": 2,
  "path": "/api/calc/cas",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "dizzy",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "sleep",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "paralyzed",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "appetite",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "nausea",
          "points": 0,
          "present": true
        }
      ],
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Lee SA",
        "doi": "10.1080/07481187.2020.1748481",
        "id": "lee-2020",
        "pmid": "32299304",
        "source": "Death Studies. 2020;44(7):393-401",
        "title": "Coronavirus Anxiety Scale: A brief mental health screener for COVID-19 related anxiety"
      },
      "formula": "cas",
      "formula_expression": "CAS = dizzy + sleep + paralyzed + appetite + nausea; each caller-assigned 0-4 (Lee 2020 / DSM-5 cross-cutting: 0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day); past two weeks; max 20; screen_ge_9 iff score ≥ 9",
      "max_score": 20,
      "score": 0,
      "screen_ge_9": false
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "dizzy",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "sleep",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "paralyzed",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "appetite",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "nausea",
          "points": 0,
          "present": true
        }
      ],
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Lee SA",
        "doi": "10.1080/07481187.2020.1748481",
        "id": "lee-2020",
        "pmid": "32299304",
        "source": "Death Studies. 2020;44(7):393-401",
        "title": "Coronavirus Anxiety Scale: A brief mental health screener for COVID-19 related anxiety"
      },
      "formula": "cas",
      "formula_expression": "CAS = dizzy + sleep + paralyzed + appetite + nausea; each caller-assigned 0-4 (Lee 2020 / DSM-5 cross-cutting: 0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day); past two weeks; max 20; screen_ge_9 iff score ≥ 9",
      "max_score": 20,
      "score": 0,
      "screen_ge_9": false
    }
  ]
}

Response

Field	Type	Description
`formula`	string	cas
`formula_expression`	string	Exact expression used
`score`	integer	CAS points 0-20
`max_score`	integer	20
`screen_ge_9`	boolean	true iff score ≥ 9 (Lee 2020 optimized cut: 90% sensitivity and 85% specificity for probable dysfunctional coronavirus-related anxiety). Not a diagnosis. No extra mild/moderate bands.
`components`	array	Per-item caller-assigned points
`citation`	object	Lee Death Studies 2020 citation
`disclaimer`	string	Not-a-device notice

Example JSON

Machine form of the same example. Frozen fixture. Not a live lookup.

{
  "components": [
    {
      "value": 0,
      "factor": "dizzy",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "sleep",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "paralyzed",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "appetite",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "nausea",
      "points": 0,
      "present": true
    }
  ],
  "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "citation": {
    "authors": "Lee SA",
    "doi": "10.1080/07481187.2020.1748481",
    "id": "lee-2020",
    "pmid": "32299304",
    "source": "Death Studies. 2020;44(7):393-401",
    "title": "Coronavirus Anxiety Scale: A brief mental health screener for COVID-19 related anxiety"
  },
  "formula": "cas",
  "formula_expression": "CAS = dizzy + sleep + paralyzed + appetite + nausea; each caller-assigned 0-4 (Lee 2020 / DSM-5 cross-cutting: 0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day); past two weeks; max 20; screen_ge_9 iff score ≥ 9",
  "max_score": 20,
  "score": 0,
  "screen_ge_9": false
}

Client errors (HTTP 400)

Invalid params return 400 without charge. Shared HTTP 402 and 503 meanings: Payments.

HTTP	Code	When
400	`invalid_cas`	CAS needs the five Lee 2020 items as integers 0-4 (not at all through nearly every day). Returned before settlement; you are not charged.
400	`invalid_items`	POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
400	`invalid_item_count`	items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
400	`invalid_item`	each items entry must be a JSON object Returned before settlement; you are not charged.

Related tools

PHQ-9 — Sum nine caller-assigned Kroenke 2001 PHQ-9 integers (0-3) and return the published total (max 27), severity cutpoints, and ≥10 screen.
GAD-7 — Sum seven caller-assigned Spitzer 2006 GAD-7 integers (0-3) and return the published 0-21 total, 5/10/15 severity cuts, and ≥10 case-finding flag.

Payment

Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. Unpaid valid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote: retry the same PAYMENT-SIGNATURE. Full handshake and shared payment errors: Payments. Stdio MCP: /docs/mcp.

Guarantees

HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON.
exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE.
HTTP 402 is unpaid only. Do not sign a second authorization because of a 503.
Execution is timeout-bounded and concurrency-capped.
Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.