Step Width Screen

Compare step width with caller-provided base-of-support limits.

Description

Step-width screening compares measured base-of-support width with a supplied interval.

Step-width screening compares measured base-of-support width with a supplied interval. The margin reports only distance above the lower bound.^[1]

Compare step width with caller-provided base-of-support limits.

When to use Step Width Screen

Use this tool to compare step width with caller-provided base-of-support limits.

Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.

How to use Step Width Screen and understand its results

Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.
Enter stepWidthCm, minimumWidthCm, maximumWidthCm using the field table and calculation rules, then run the tool.
Read withinRange, marginToMinimumCm. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
stepWidthCm	Step width cm	number	Required
minimumWidthCm	Minimum width cm	number	Required
maximumWidthCm	Maximum width cm	number	Required

Enter nonnegative width and ordered nonnegative bounds in cm. Return inclusive gate and signed minimum margin.

within=minimum≤width≤maximum; margin=width−minimum

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
withinRange	Within range	boolean
marginToMinimumCm	Margin to minimum cm	number

json

{
  "input": {
    "stepWidthCm": 12,
    "minimumWidthCm": 10,
    "maximumWidthCm": 20
  },
  "output": {
    "withinRange": true,
    "marginToMinimumCm": 2
  }
}

Limitations and assumptions

No gait diagnosis or population reference interval is embedded.

Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.

Alternative or Complementary methods

Use Crossover Step Screen: Flag foot placements narrower than a caller-supplied step-width limit. For a complementary task, use Antalgic Stance Asymmetry: Quantify left/right gait stance-time asymmetry relative to their mean.

References

Step Width Screen — tool.io

Similar or alternative tools

Crossover Step Screen
Flag foot placements narrower than a caller-supplied step-width limit.
Antalgic Stance Asymmetry
Quantify left/right gait stance-time asymmetry relative to their mean.