PIAMA preschool asthma prediction score

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).

LIVE $0.005 USDC GET /api/calc/piama

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

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

What it computes

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).

When to use

When an agent has caller-assigned sex, post-term delivery, parental education and inhaled-medication flags, wheezing frequency, wheeze or dyspnea apart from colds, serious-infection frequency, and eczema with rash, and needs the published PIAMA Table III decimal total rather than API, mAPI, or a simplified integer port.

When not to use

Not a medical device and not a diagnosis of asthma. magent does not examine the child.
Decimal Caudri 2009 Table III clinical-prediction weights only. This is not a simplified 0–18 integer port.
Not the Castro-Rodriguez 2000 Asthma Predictive Index (API) and not the modified Asthma Predictive Index (mAPI).
wheeze_dyspnea_apart_from_colds was collected only at ages 3–4 in PIAMA; younger children were treated as negative by default. The caller assigns the boolean. magent does not take numeric age and does not auto-override.
below_10 and ge_30 are the published abstract flags (~3% and ~42% asthma at 7–8 years). Table IV cutoffs 15/20/25/35 are test characteristics, not exclusive bands. magent does not return a continuous probability.

Formula

piama = 4.6*male + 7.3*postterm_delivery + 4.2*medium_low_parental_education + 7.7*parental_inhaled_medication + wheezing(none 0, 1_to_3 4.2, ge_4 9.1) + 7.1*wheeze_dyspnea_apart_from_colds + serious_infections(none 0, 1_to_2 4.6, ge_3 6.9) + 8.2*eczema_with_rash; Caudri 2009 Table III; max 55.1; below_10 iff score < 10 (~3% asthma at 7-8 years); ge_30 iff score ≥ 30 (~42% risk)

Citation

Title: Predicting the long-term prognosis of children with symptoms suggestive of asthma at preschool age
Authors: Caudri D, Wijga A, Schipper CMA, Hoekstra M, Postma DS, Koppelman GH, Brunekreef B, Smit HA, de Jongste JC
Source: J Allergy Clin Immunol. 2009;124(5):903-910
DOI: 10.1016/j.jaci.2009.06.045

Worked example

Female, all flags false, wheezing none, infections none

Given: eczema_with_rash=falsemedium_low_parental_education=falseparental_inhaled_medication=falsepostterm_delivery=falseserious_infections=nonesex=femalewheeze_dyspnea_apart_from_colds=falsewheezing=none

Female and all flags false; wheezing none; serious_infections none → 0
Score = 0 (max 55.1); below_10 = true (score < 10); ge_30 = false

Male only

Given: eczema_with_rash=falsemedium_low_parental_education=falseparental_inhaled_medication=falsepostterm_delivery=falseserious_infections=nonesex=malewheeze_dyspnea_apart_from_colds=falsewheezing=none

Male scores 4.6; remaining Table III factors are absent
Score = 4.6 (max 55.1); below_10 = true; ge_30 = false

All Table III factors at maximum weight

Given: eczema_with_rash=truemedium_low_parental_education=trueparental_inhaled_medication=truepostterm_delivery=trueserious_infections=ge_3sex=malewheeze_dyspnea_apart_from_colds=truewheezing=ge_4

male 4.6 + postterm 7.3 + medium_low education 4.2 + parental inhaled medication 7.7 + wheezing ge_4 9.1 + wheeze/dyspnea apart 7.1 + infections ge_3 6.9 + eczema with rash 8.2
Score = 55.1 (max 55.1); below_10 = false; ge_30 = true (score ≥ 30)

Also searched as

PIAMA score
Caudri PIAMA
preschool asthma prediction score
Caudri 2009
PIAMA Table III
children symptoms suggestive of asthma
PIAMA clinical prediction score
preschool wheezing asthma risk

Try

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

/api/calc/piama?sex=female&postterm_delivery=false&medium_low_parental_education=false&parental_inhaled_medication=false&wheezing=none&wheeze_dyspnea_apart_from_colds=false&serious_infections=none&eczema_with_rash=false

Full URL: https://api.magentlab.com/api/calc/piama?sex=female&postterm_delivery=false&medium_low_parental_education=false&parental_inhaled_medication=false&wheezing=none&wheeze_dyspnea_apart_from_colds=false&serious_infections=none&eczema_with_rash=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/piama?sex=female&postterm_delivery=false&medium_low_parental_education=false&parental_inhaled_medication=false&wheezing=none&wheeze_dyspnea_apart_from_colds=false&serious_infections=none&eczema_with_rash=false"

Parameters

Name	Type	Required	Description
`sex`	string	required · female, male	Caller-assigned sex (Caudri 2009 Table III). male scores 4.6; female scores 0. magent does not assign sex.
`postterm_delivery`	boolean	required	Post-term delivery as assigned by the caller (Caudri 2009 Table III). true scores 7.3. magent does not take an obstetric history.
`medium_low_parental_education`	boolean	required	Medium or low education in at least one parent as assigned by the caller (Caudri 2009 Table III). true scores 4.2. magent does not take a parental education history.
`parental_inhaled_medication`	boolean	required	Inhalation medication by at least one parent as assigned by the caller (Caudri 2009 Table III). true scores 7.7. magent does not take a family medication history.
`wheezing`	string	required · none, 1_to_3, ge_4	Wheezing frequency in the last year (Caudri 2009 Table III). none scores 0; 1_to_3 (infrequent, 1–3 times/year) scores 4.2; ge_4 (frequent, ≥4 times/year) scores 9.1. Mutually exclusive. magent does not auscultate.
`wheeze_dyspnea_apart_from_colds`	boolean	required	Wheeze or dyspnea apart from colds as assigned by the caller (Caudri 2009 Table III). true scores 7.1. PIAMA collected this only at ages 3–4 and treated younger children as negative by default; the caller assigns the boolean. magent does not take numeric age and does not auto-override.
`serious_infections`	string	required · none, 1_to_2, ge_3	Serious respiratory or ear/nose/throat infections per year (Caudri 2009 Table III). none scores 0; 1_to_2 (1–2 times/year) scores 4.6; ge_3 (≥3 times/year) scores 6.9. Mutually exclusive. magent does not diagnose infection.
`eczema_with_rash`	boolean	required	Doctor's diagnosis of eczema AND eczematous rash present, as assigned by the caller (Caudri 2009 Table III). true scores 8.2. magent does not examine the child.

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/piama 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": [
    {
      "eczema_with_rash": "false",
      "medium_low_parental_education": "false",
      "parental_inhaled_medication": "false",
      "postterm_delivery": "false",
      "serious_infections": "none",
      "sex": "female",
      "wheeze_dyspnea_apart_from_colds": "false",
      "wheezing": "none"
    },
    {
      "eczema_with_rash": "false",
      "medium_low_parental_education": "false",
      "parental_inhaled_medication": "false",
      "postterm_delivery": "false",
      "serious_infections": "none",
      "sex": "female",
      "wheeze_dyspnea_apart_from_colds": "false",
      "wheezing": "none"
    }
  ]
}

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/piama",
  "items": [
    {
      "components": [
        {
          "factor": "male",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "postterm_delivery",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "medium_low_parental_education",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "parental_inhaled_medication",
          "points": 0.0,
          "present": false
        },
        {
          "value": "none",
          "factor": "wheezing",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "wheeze_dyspnea_apart_from_colds",
          "points": 0.0,
          "present": false
        },
        {
          "value": "none",
          "factor": "serious_infections",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "eczema_with_rash",
          "points": 0.0,
          "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": "Caudri D, Wijga A, Schipper CMA, Hoekstra M, Postma DS, Koppelman GH, Brunekreef B, Smit HA, de Jongste JC",
        "doi": "10.1016/j.jaci.2009.06.045",
        "id": "caudri-2009",
        "pmid": "19665765",
        "source": "J Allergy Clin Immunol. 2009;124(5):903-910",
        "title": "Predicting the long-term prognosis of children with symptoms suggestive of asthma at preschool age"
      },
      "formula": "piama",
      "formula_expression": "piama = 4.6*male + 7.3*postterm_delivery + 4.2*medium_low_parental_education + 7.7*parental_inhaled_medication + wheezing(none 0, 1_to_3 4.2, ge_4 9.1) + 7.1*wheeze_dyspnea_apart_from_colds + serious_infections(none 0, 1_to_2 4.6, ge_3 6.9) + 8.2*eczema_with_rash; Caudri 2009 Table III; max 55.1; below_10 iff score < 10 (~3% asthma at 7-8 years); ge_30 iff score ≥ 30 (~42% risk)",
      "max_score": 55.1,
      "score": 0.0,
      "below_10": true,
      "ge_30": false
    },
    {
      "components": [
        {
          "factor": "male",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "postterm_delivery",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "medium_low_parental_education",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "parental_inhaled_medication",
          "points": 0.0,
          "present": false
        },
        {
          "value": "none",
          "factor": "wheezing",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "wheeze_dyspnea_apart_from_colds",
          "points": 0.0,
          "present": false
        },
        {
          "value": "none",
          "factor": "serious_infections",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "eczema_with_rash",
          "points": 0.0,
          "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": "Caudri D, Wijga A, Schipper CMA, Hoekstra M, Postma DS, Koppelman GH, Brunekreef B, Smit HA, de Jongste JC",
        "doi": "10.1016/j.jaci.2009.06.045",
        "id": "caudri-2009",
        "pmid": "19665765",
        "source": "J Allergy Clin Immunol. 2009;124(5):903-910",
        "title": "Predicting the long-term prognosis of children with symptoms suggestive of asthma at preschool age"
      },
      "formula": "piama",
      "formula_expression": "piama = 4.6*male + 7.3*postterm_delivery + 4.2*medium_low_parental_education + 7.7*parental_inhaled_medication + wheezing(none 0, 1_to_3 4.2, ge_4 9.1) + 7.1*wheeze_dyspnea_apart_from_colds + serious_infections(none 0, 1_to_2 4.6, ge_3 6.9) + 8.2*eczema_with_rash; Caudri 2009 Table III; max 55.1; below_10 iff score < 10 (~3% asthma at 7-8 years); ge_30 iff score ≥ 30 (~42% risk)",
      "max_score": 55.1,
      "score": 0.0,
      "below_10": true,
      "ge_30": false
    }
  ]
}

Response

Field	Type	Description
`formula`	string	piama
`formula_expression`	string	Caudri 2009 Table III decimal clinical prediction expression
`score`	number	Caudri 2009 Table III points 0-55.1, one decimal
`max_score`	number	Always 55.1
`below_10`	boolean	true iff score < 10 (Caudri 2009 abstract: ~3% risk of asthma at 7–8 years). Not a diagnosis of asthma.
`ge_30`	boolean	true iff score ≥ 30 (Caudri 2009 abstract: ~42% risk of asthma at 7–8 years). Not a diagnosis of asthma.
`components`	array	Per-factor Table III points
`citation`	object	Caudri 2009 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": "male",
      "points": 0.0,
      "present": false
    },
    {
      "factor": "postterm_delivery",
      "points": 0.0,
      "present": false
    },
    {
      "factor": "medium_low_parental_education",
      "points": 0.0,
      "present": false
    },
    {
      "factor": "parental_inhaled_medication",
      "points": 0.0,
      "present": false
    },
    {
      "value": "none",
      "factor": "wheezing",
      "points": 0.0,
      "present": false
    },
    {
      "factor": "wheeze_dyspnea_apart_from_colds",
      "points": 0.0,
      "present": false
    },
    {
      "value": "none",
      "factor": "serious_infections",
      "points": 0.0,
      "present": false
    },
    {
      "factor": "eczema_with_rash",
      "points": 0.0,
      "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": "Caudri D, Wijga A, Schipper CMA, Hoekstra M, Postma DS, Koppelman GH, Brunekreef B, Smit HA, de Jongste JC",
    "doi": "10.1016/j.jaci.2009.06.045",
    "id": "caudri-2009",
    "pmid": "19665765",
    "source": "J Allergy Clin Immunol. 2009;124(5):903-910",
    "title": "Predicting the long-term prognosis of children with symptoms suggestive of asthma at preschool age"
  },
  "formula": "piama",
  "formula_expression": "piama = 4.6*male + 7.3*postterm_delivery + 4.2*medium_low_parental_education + 7.7*parental_inhaled_medication + wheezing(none 0, 1_to_3 4.2, ge_4 9.1) + 7.1*wheeze_dyspnea_apart_from_colds + serious_infections(none 0, 1_to_2 4.6, ge_3 6.9) + 8.2*eczema_with_rash; Caudri 2009 Table III; max 55.1; below_10 iff score < 10 (~3% asthma at 7-8 years); ge_30 iff score ≥ 30 (~42% risk)",
  "max_score": 55.1,
  "score": 0.0,
  "below_10": true,
  "ge_30": false
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_sex`	sex must be female or male Returned before settlement; you are not charged.
400	`invalid_flag`	boolean clinical flags must be true or false Returned before settlement; you are not charged.
400	`invalid_piama`	wheezing must be none, 1_to_3, or ge_4; serious_infections must be none, 1_to_2, or ge_3 (Caudri 2009 PIAMA Table III). 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.
PRAM — Sum five caller-assigned Chalut 2000 PRAM item points and return the published 0-12 total.

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.