Pediatric Asthma Risk Score (PARS)

PARS

Sum the Biagini Myers 2019 Table III Pediatric Asthma Risk Score weights and return the Fig E1 integer predicted risk of asthma by age 7.

LIVE $0.005 USDC GET /api/calc/pars

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

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

What it computes

Sum the Biagini Myers 2019 Table III Pediatric Asthma Risk Score weights and return the Fig E1 integer predicted risk of asthma by age 7.

When to use

When an agent has caller-assigned parental asthma, eczema before age 3, wheezing apart from colds, wheezing before age 3, African American race as used in Biagini Myers 2019, and SPT ≥2 aeroallergen and/or food allergen flags, and needs the published PARS total and Fig E1 percent rather than API, mAPI, or a named risk band.

When not to use

Not a medical device and not an asthma diagnosis. magent does not examine the child.
african_american is caller-assigned African American race as used in Biagini Myers 2019. magent does not assign race.
Not the Castro-Rodriguez 2000 Asthma Predictive Index (API) and not the modified Asthma Predictive Index (mAPI).
magent does not perform skin prick testing. spt_ge_2 is a caller-assigned flag for SPT positive to ≥2 aeroallergens and/or food allergens.
Fig E1 reports predicted risk of asthma by age 7 as integers for attainable scores 0, 2-12, and 14. Scores 1 and 13 are unattainable given Table III weights. magent does not invent percents for unattainable scores and does not return named low/moderate/high bands.

Formula

PARS = 2*parental_asthma + 2*eczema_before_age_3 + 3*wheezing_apart_from_colds + 3*wheezing_before_age_3 + 2*african_american + 2*spt_ge_2; Biagini Myers 2019 Table III (OR rounded to nearest integer) and Fig E1; max 14; predicted_asthma_percent is the Fig E1 integer predicted risk of asthma by age 7; scores 1 and 13 are unattainable

Citation

Title: A Pediatric Asthma Risk Score to better predict asthma development in young children
Authors: Biagini Myers JM, Schauberger E, He H, Martin LJ, Kroner J, Hill GM, Ryan PH, LeMasters GK, Bernstein DI, Lockey JE, Arshad SH, Kurukulaaratchy R, Khurana Hershey GK
Source: J Allergy Clin Immunol. 2019;143(4):1803-1810.e2
DOI: 10.1016/j.jaci.2018.09.037

Worked example

All flags false

Given: african_american=falseeczema_before_age_3=falseparental_asthma=falsespt_ge_2=falsewheezing_apart_from_colds=falsewheezing_before_age_3=false

All six Table III flags false → score 0
Fig E1 predicted asthma by age 7 = 3%

All flags true

Given: african_american=trueeczema_before_age_3=trueparental_asthma=truespt_ge_2=truewheezing_apart_from_colds=truewheezing_before_age_3=true

parental asthma 2 + eczema before age 3 2 + wheezing apart from colds 3 + wheezing before age 3 3 + African American 2 + SPT ≥2 2
Score = 14 (max 14); Fig E1 predicted asthma by age 7 = 79%

Also searched as

Pediatric Asthma Risk Score
PARS
Biagini Myers PARS
PARS Table III
asthma by age 7 PARS
pediatric asthma risk score PARS
PARS Fig E1
young children asthma development score

Try

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

/api/calc/pars?parental_asthma=false&eczema_before_age_3=false&wheezing_apart_from_colds=false&wheezing_before_age_3=false&african_american=false&spt_ge_2=false

Full URL: https://api.magentlab.com/api/calc/pars?parental_asthma=false&eczema_before_age_3=false&wheezing_apart_from_colds=false&wheezing_before_age_3=false&african_american=false&spt_ge_2=false

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/pars?parental_asthma=false&eczema_before_age_3=false&wheezing_apart_from_colds=false&wheezing_before_age_3=false&african_american=false&spt_ge_2=false"

Parameters

Name	Type	Required	Description
`parental_asthma`	boolean	required	Parental asthma as assigned by the caller (Biagini Myers 2019 Table III). true scores 2. magent does not take a family history. true or false.
`eczema_before_age_3`	boolean	required	Eczema before age 3 years as assigned by the caller (Biagini Myers 2019 Table III). true scores 2. magent does not examine the child. true or false.
`wheezing_apart_from_colds`	boolean	required	Wheezing apart from colds as assigned by the caller (Biagini Myers 2019 Table III). true scores 3. magent does not auscultate. true or false.
`wheezing_before_age_3`	boolean	required	Wheezing before age 3 years as assigned by the caller (Biagini Myers 2019 Table III). true scores 3. magent does not auscultate. true or false.
`african_american`	boolean	required	Caller-assigned African American race as used in Biagini Myers 2019 Table III. true scores 2. magent does not assign race. true or false.
`spt_ge_2`	boolean	required	Skin prick test positive to ≥2 aeroallergens and/or food allergens as assigned by the caller (Biagini Myers 2019 Table III). true scores 2. magent does not perform SPT. true or false.

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/pars 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": [
    {
      "african_american": "false",
      "eczema_before_age_3": "false",
      "parental_asthma": "false",
      "spt_ge_2": "false",
      "wheezing_apart_from_colds": "false",
      "wheezing_before_age_3": "false"
    },
    {
      "african_american": "false",
      "eczema_before_age_3": "false",
      "parental_asthma": "false",
      "spt_ge_2": "false",
      "wheezing_apart_from_colds": "false",
      "wheezing_before_age_3": "false"
    }
  ]
}

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/pars",
  "items": [
    {
      "components": [
        {
          "factor": "parental_asthma",
          "points": 0,
          "present": false
        },
        {
          "factor": "eczema_before_age_3",
          "points": 0,
          "present": false
        },
        {
          "factor": "wheezing_apart_from_colds",
          "points": 0,
          "present": false
        },
        {
          "factor": "wheezing_before_age_3",
          "points": 0,
          "present": false
        },
        {
          "factor": "african_american",
          "points": 0,
          "present": false
        },
        {
          "factor": "spt_ge_2",
          "points": 0,
          "present": false
        }
      ],
      "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": "Biagini Myers JM, Schauberger E, He H, Martin LJ, Kroner J, Hill GM, Ryan PH, LeMasters GK, Bernstein DI, Lockey JE, Arshad SH, Kurukulaaratchy R, Khurana Hershey GK",
        "doi": "10.1016/j.jaci.2018.09.037",
        "id": "biagini-myers-2019-pars",
        "pmid": "30554722",
        "source": "J Allergy Clin Immunol. 2019;143(4):1803-1810.e2",
        "title": "A Pediatric Asthma Risk Score to better predict asthma development in young children"
      },
      "formula": "pars",
      "formula_expression": "PARS = 2*parental_asthma + 2*eczema_before_age_3 + 3*wheezing_apart_from_colds + 3*wheezing_before_age_3 + 2*african_american + 2*spt_ge_2; Biagini Myers 2019 Table III (OR rounded to nearest integer) and Fig E1; max 14; predicted_asthma_percent is the Fig E1 integer predicted risk of asthma by age 7; scores 1 and 13 are unattainable",
      "max_score": 14,
      "score": 0,
      "predicted_asthma_percent": 3
    },
    {
      "components": [
        {
          "factor": "parental_asthma",
          "points": 0,
          "present": false
        },
        {
          "factor": "eczema_before_age_3",
          "points": 0,
          "present": false
        },
        {
          "factor": "wheezing_apart_from_colds",
          "points": 0,
          "present": false
        },
        {
          "factor": "wheezing_before_age_3",
          "points": 0,
          "present": false
        },
        {
          "factor": "african_american",
          "points": 0,
          "present": false
        },
        {
          "factor": "spt_ge_2",
          "points": 0,
          "present": false
        }
      ],
      "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": "Biagini Myers JM, Schauberger E, He H, Martin LJ, Kroner J, Hill GM, Ryan PH, LeMasters GK, Bernstein DI, Lockey JE, Arshad SH, Kurukulaaratchy R, Khurana Hershey GK",
        "doi": "10.1016/j.jaci.2018.09.037",
        "id": "biagini-myers-2019-pars",
        "pmid": "30554722",
        "source": "J Allergy Clin Immunol. 2019;143(4):1803-1810.e2",
        "title": "A Pediatric Asthma Risk Score to better predict asthma development in young children"
      },
      "formula": "pars",
      "formula_expression": "PARS = 2*parental_asthma + 2*eczema_before_age_3 + 3*wheezing_apart_from_colds + 3*wheezing_before_age_3 + 2*african_american + 2*spt_ge_2; Biagini Myers 2019 Table III (OR rounded to nearest integer) and Fig E1; max 14; predicted_asthma_percent is the Fig E1 integer predicted risk of asthma by age 7; scores 1 and 13 are unattainable",
      "max_score": 14,
      "score": 0,
      "predicted_asthma_percent": 3
    }
  ]
}

Response

Field	Type	Description
`formula`	string	pars
`formula_expression`	string	Biagini Myers 2019 Table III PARS weights and Fig E1 mapping
`score`	integer	PARS points 0-14; 1 and 13 are unattainable
`max_score`	integer	14
`predicted_asthma_percent`	integer	Fig E1 integer predicted risk of asthma by age 7. Not a named low/moderate/high band. Not a diagnosis of asthma.
`components`	array	Per-factor Table III points
`citation`	object	Biagini Myers 2019 J Allergy Clin Immunol citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "factor": "parental_asthma",
      "points": 0,
      "present": false
    },
    {
      "factor": "eczema_before_age_3",
      "points": 0,
      "present": false
    },
    {
      "factor": "wheezing_apart_from_colds",
      "points": 0,
      "present": false
    },
    {
      "factor": "wheezing_before_age_3",
      "points": 0,
      "present": false
    },
    {
      "factor": "african_american",
      "points": 0,
      "present": false
    },
    {
      "factor": "spt_ge_2",
      "points": 0,
      "present": false
    }
  ],
  "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": "Biagini Myers JM, Schauberger E, He H, Martin LJ, Kroner J, Hill GM, Ryan PH, LeMasters GK, Bernstein DI, Lockey JE, Arshad SH, Kurukulaaratchy R, Khurana Hershey GK",
    "doi": "10.1016/j.jaci.2018.09.037",
    "id": "biagini-myers-2019-pars",
    "pmid": "30554722",
    "source": "J Allergy Clin Immunol. 2019;143(4):1803-1810.e2",
    "title": "A Pediatric Asthma Risk Score to better predict asthma development in young children"
  },
  "formula": "pars",
  "formula_expression": "PARS = 2*parental_asthma + 2*eczema_before_age_3 + 3*wheezing_apart_from_colds + 3*wheezing_before_age_3 + 2*african_american + 2*spt_ge_2; Biagini Myers 2019 Table III (OR rounded to nearest integer) and Fig E1; max 14; predicted_asthma_percent is the Fig E1 integer predicted risk of asthma by age 7; scores 1 and 13 are unattainable",
  "max_score": 14,
  "score": 0,
  "predicted_asthma_percent": 3
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_pars`	PARS flags must be true or false as in Biagini Myers 2019 Table III / Fig E1. 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

Asthma Predictive Index — Apply Castro-Rodriguez 2000 Table 1 and return stringent and loose Asthma Predictive Index flags from caller-assigned early-wheeze class and five major/minor criteria.
Modified Asthma Predictive Index — Apply Guilbert 2004 PEAK Table I and return a binary modified Asthma Predictive Index flag from caller-assigned history of 4 or more wheezing episodes and six major/minor criteria.
PIAMA — Sum the Caudri 2009 PIAMA Table III decimal clinical prediction weights for preschool children with symptoms suggestive of asthma and return below_10 (score < 10) and ge_30 (score ≥ 30).

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.