Average Contraction Duration Calculator

Actual paired onset/end contraction durations and mean; independently identified nonoverlapping events required. Not onset frequency, labour diagnosis or a universal pattern threshold.

Description

Contraction durations measure paired start-to-end boundaries.

Contraction durations measure paired start-to-end boundaries.^[1]

A chronological event inventory keeps duration separate from onset spacing.

When to use Average Contraction Duration Calculator

Use this tool to calculate or review the supplied observations under the stated rules. Establish the observation date, units, measurement context and independently applicable clinical reference or calibrated model.

How to use Average Contraction Duration Calculator and understand its results

Establish the observation date, units, measurement context and independently applicable clinical reference or calibrated model.
Enter independentlyRecordedContractionOnsetsSeconds, independentlyRecordedContractionEndsSeconds, using the field meanings and rules below, then run the tool.
Read result.observedContractionDurationsSeconds, result.observedMeanContractionDurationSeconds. Use the units and sign conventions below.
Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.

Input field	Meaning	Value type	Requirement
independentlyRecordedContractionOnsetsSeconds	Independently recorded contraction onsets seconds	list of number	Required
independentlyRecordedContractionEndsSeconds	Independently recorded contraction ends seconds	list of number	Required

Require aligned onset/end second-coordinate lists and at least two strictly increasing onsets. Each end must be no earlier than its paired onset and no later than the next onset. Zero duration and touching events are permitted. Return end-minus-start durations and their arithmetic mean; coordinates themselves may be signed.

duration_i=end_i−onset_i; meanDuration=mean(durations)

Use the matching field units and the exact boundary, ordering and reference rules above.

Output field	Meaning	Value type
result	Structured result; its nested fields below contain the actual calculation or selected reference	object
result.observedContractionDurationsSeconds	Observed Contraction Durations Seconds	list
result.observedMeanContractionDurationSeconds	Observed Mean Contraction Duration Seconds	number

json

{
  "input": {
    "independentlyRecordedContractionOnsetsSeconds": [
      0,
      300
    ],
    "independentlyRecordedContractionEndsSeconds": [
      60,
      380
    ]
  },
  "output": {
    "result": {
      "observedContractionDurationsSeconds": [
        60,
        80
      ],
      "observedMeanContractionDurationSeconds": 70
    }
  }
}

Limitations and assumptions

Dating evidence, acquisition conditions and applicable clinical references remain independently established. The output describes supplied observations or a conditional model without diagnosing an outcome, choosing a dose or verifying clinical applicability.

Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Lists and matrices must be dense, without missing cells. Numeric lists allow at most 10000 entries; ordinary string lists allow at most 128 strings of 128 UTF-16 units each; numeric matrices allow at most 128 rows and 128 columns, subject to narrower requirements above. Extremely large composite outputs are rejected.

Alternative or Complementary methods

For a related step, use Total Labor Duration Calculator: Total labor duration requires independently established onset and endpoint boundaries. For a complementary comparison, use Second Stage Labor Duration Calculator: Second-stage labor duration depends on independently identified stage boundaries.

References

Average Contraction Duration Calculator — tool.io

Similar or alternative tools

Total Labor Duration Calculator
Total labor duration requires independently established onset and endpoint boundaries.
Second Stage Labor Duration Calculator
Second-stage labor duration depends on independently identified stage boundaries.