Simplified Oral Hygiene Index Calculator

Greene–Vermillion OHI-Ssix selected surface convention:mean debris+mean calculus on actual independently coded same selected sites0–3. Partial mean explicitly retains unknowns, not a complete mouth index or clinical interpretation.

Description

The simplified oral hygiene index combines debris and calculus components at six declared sites.

The simplified oral hygiene index combines debris and calculus components at six declared sites.^[1]

Its interpretation depends on correct site selection and clinical coding. Use this tool to calculate the stated observation or conditional model from supplied measurements.

When to use Simplified Oral Hygiene Index Calculator

Use this tool to calculate the stated observation or conditional model from supplied measurements. Establish the qualified examination or measurement context, matching instrument/protocol edition, site order and units.

How to use Simplified Oral Hygiene Index Calculator and understand its results

Establish the qualified examination or measurement context, matching instrument/protocol edition, site order and units.
Enter independentlyCodedDebrisSiteScores, independentlyCodedCalculusSiteScores, siteEvidenceKnownFlags, using the field meanings and rules below, then run the tool.
Read result.observedKnownDebrisMean, result.observedKnownCalculusMean, result.observedKnownOhi, result.unknownSiteIndices. Interpret each field using the units, signs and evidence rules below.
If input validation fails, correct the reported field and run again. Before applying a successful result, check the stated reference scope, units, assumptions and any retained unknown evidence.

Input field	Meaning	Value type	Requirement
independentlyCodedDebrisSiteScores	Independently coded debris site scores	list of number	Required
independentlyCodedCalculusSiteScores	Independently coded calculus site scores	list of number	Required
siteEvidenceKnownFlags	Site evidence known flags; 1 means known and 0 means unknown; keep the same item order	list of number	Required

Enter exactly 6 debris scores with aligned calculus scores and binary known flags. Each score, including unknown placeholders, must be integer 0–3. Require at least one known site. Calculate debris and calculus means separately over the same known subset, add them and retain zero-based unknown indices. No site selection, probing or clinical severity threshold is supplied.

debrisMean=meanKnown(debris); calculusMean=meanKnown(calculus); observedKnownOhi=debrisMean+calculusMean

Apply the field units and exact ordering, boundary and evidence rules above.

Output field	Meaning	Value type
result	Structured result containing the calculation or selected reference fields below	object
result.observedKnownDebrisMean	Observed Known Debris Mean; use the units, sign convention and calculation stated above	number
result.observedKnownCalculusMean	Observed Known Calculus Mean; use the units, sign convention and calculation stated above	number
result.observedKnownOhi	Observed Known Ohi; use the units, sign convention and calculation stated above	number
result.unknownSiteIndices	Zero-based positions of unknown site observations	list of values

json

{
  "input": {
    "independentlyCodedDebrisSiteScores": [
      1,
      1,
      1,
      1,
      1,
      1
    ],
    "independentlyCodedCalculusSiteScores": [
      2,
      2,
      2,
      2,
      2,
      2
    ],
    "siteEvidenceKnownFlags": [
      1,
      1,
      1,
      1,
      1,
      1
    ]
  },
  "output": {
    "result": {
      "observedKnownDebrisMean": 1,
      "observedKnownCalculusMean": 2,
      "observedKnownOhi": 3,
      "unknownSiteIndices": []
    }
  }
}

Limitations and assumptions

Its interpretation depends on correct site selection and clinical coding. Results depend on the independently established measurement basis and the exact model assumptions above.

Every listed input requires an explicit value. Unexpected fields, incorrect value types, nonfinite numbers and sparse numeric arrays fail validation; tool-specific bounds and alignment rules apply as described above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful calculation that reports a false comparison or retains unknown evidence.

Alternative or Complementary methods

Use Greene-Vermillion Oral Hygiene Index Calculator to examine a related aspect: The full oral hygiene index combines debris and calculus observations at a declared twelve-site set.

Use Debris Index Calculator where its separate inputs and scope apply: A debris index summarizes independently coded deposits at examination sites.

References

Simplified Oral Hygiene Index Calculator — tool.io

Similar or alternative tools

Greene-Vermillion Oral Hygiene Index Calculator
The full oral hygiene index combines debris and calculus observations at a declared twelve-site set.
Debris Index Calculator
A debris index summarizes independently coded deposits at examination sites.