Footrest Necessity Flag by Leg Length Mismatch Checker
Measured seat/shod leg-height mismatch screen, not automatic footrest necessity independent of task. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.
Description
Seat height above shod popliteal height creates a measurable height difference.
Seat height above shod popliteal height creates a measurable height difference.1
Comparing only the positive excess with a chosen allowance does not assess every reason a footrest may be needed. Use this tool to calculate footrest Necessity Flag by Leg Length Mismatch Checker from the supplied measurements and assumptions.
When to use Footrest Necessity Flag by Leg Length Mismatch Checker
Use this tool to calculate footrest Necessity Flag by Leg Length Mismatch Checker from the supplied measurements and assumptions. Establish the observation protocol, units, task and reference population or review criterion before entering measurements.
How to use Footrest Necessity Flag by Leg Length Mismatch Checker and understand its results
- Establish the observation protocol, units, task and reference population or review criterion before entering measurements.
- Enter observedSeatHeightCm, observedShodPoplitealHeightCm, callerAllowedMismatchCm, using the field meanings and rules below, then run the tool.
- Read signedSeatLegMismatchCm, callerFootrestReview. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedSeatHeightCm | Observed seat height cm | number | Required |
| observedShodPoplitealHeightCm | Observed shod popliteal height cm | number | Required |
| callerAllowedMismatchCm | Caller allowed mismatch cm | number | Required |
Enter positive seat and shod popliteal heights plus a nonnegative allowed excess. Return seat−popliteal and flag only when that signed difference exceeds the allowance. A large negative difference is not flagged by this one-sided screen.
review=(seatHeight−shodPoplitealHeight)>allowedExcess Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| signedSeatLegMismatchCm | Signed Seat Leg Mismatch Cm; follow the units, sign, ordering and evidence convention stated above | number |
| callerFootrestReview | Caller Footrest Review; follow the units, sign, ordering and evidence convention stated above | boolean |
{
"input": {
"observedSeatHeightCm": 50,
"observedShodPoplitealHeightCm": 45,
"callerAllowedMismatchCm": 2
},
"output": {
"signedSeatLegMismatchCm": 5,
"callerFootrestReview": true
}
}Limitations and assumptions
Comparing only the positive excess with a chosen allowance does not assess every reason a footrest may be needed. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use Desk Height from Elbow Resting Height Calculator for this related task: An elbow-based desk model accounts for work-surface thickness and a chosen hand offset.
Use Anthropometric Bed Height Transfer Ease Checker when its separate inputs and assumptions fit the question: Transfer geometry depends on the difference between bed and seat heights.
References
Similar or alternative tools
- Desk Height from Elbow Resting Height Calculator
An elbow-based desk model accounts for work-surface thickness and a chosen hand offset.
- Anthropometric Bed Height Transfer Ease Checker
Transfer geometry depends on the difference between bed and seat heights.