Description
Observed two-point research height velocity with an explicit annualization denominator, without a growth-chart percentile or diagnosis.
Pediatric research records use chronological age, visit windows, measurement resolution, task observations, and caregiver reports. Missing observation differs from noncompletion, and a completeness share depends on its denominator. Arithmetic on supplied records is separate from a developmental or clinical assessment.
Observed two-point research height velocity with an explicit annualization denominator, without a growth-chart percentile or diagnosis.
When to use this tool
Use Child Height Velocity Two Observations when you need this age, observation, visit, measurement, or record-completeness calculation with supplied inputs.
How to use the tool and how it works
- Enter firstHeight, secondHeight, elapsedDays, yearDays. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read heightChange, perYear. Use the output convention below.
For nonnegative firstHeight and secondHeight and positive elapsedDays and yearDays return heightChange=second-first and perYear=heightChange*yearDays/elapsedDays.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| firstHeight | First Height | Required. Finite number; minimum 0. |
| secondHeight | Second Height | Required. Finite number; minimum 0. |
| elapsedDays | Elapsed Days | Required. Finite number; strictly above 0. |
| yearDays | Year Days | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| heightChange | Height Change | Required. Finite number. |
| perYear | Annualized height change in the input length unit per supplied yearDays period. | Required. Finite number. |
{
"input": {
"firstHeight": 100,
"secondHeight": 103,
"elapsedDays": 180,
"yearDays": 360
},
"output": {
"heightChange": 3,
"perYear": 6
}
}Limitations and assumptions
- Heights need one length unit and yearDays explicitly defines the annualization period. Negative growth is retained; measurement error, growth charts, age/sex reference ranges, and clinical interpretation are not provided.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Signed zero is exported as zero.
Alternative or Complementary methods
Use verified dates, measurement protocols, and observation definitions for the intended research question. A clinical interpretation needs the relevant age-specific assessment and context beyond the arithmetic record check.
References
Similar or alternative tools
- Child Height Unit Resolution
Convert an explicit research height and measurement quantum without growth interpretation.
- Child Age Calendar Partial Interval
Propagate supplied absolute calendar-day birth bounds without approximating months or developmental age.