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      • Query Statistics Collection PRO

      The Health.queryStatisticsCollection() method retrieves time-based aggregated statistics for a given HealthQuantityType over a specified date range. It returns a HealthStatisticsCollection object, which contains multiple HealthStatistics entries aligned to defined time intervals (such as daily, weekly, or monthly).

      This method is ideal for analyzing trends, building charts, and generating historical summaries of health data.

      Method Signature

      function queryStatisticsCollection(
  quantityType: HealthQuantityType,
  options: {
    startDate?: Date
    endDate?: Date
    strictStartDate?: boolean
    strictEndDate?: boolean
    statisticsOptions?: HealthStatisticsOptions | Array<HealthStatisticsOptions>
    anchorDate: Date
    intervalComponents: DateComponents
  }
): Promise<HealthStatisticsCollection>

      Parameters

      NameTypeRequiredDescription
      quantityTypeHealthQuantityTypeYesThe health quantity type to query (e.g., "stepCount", "heartRate").
      options.startDateDateNoThe start date of the time range. Samples outside this range will be excluded.
      options.endDateDateNoThe end date of the time range.
      options.strictStartDatebooleanNoIf true, includes only statistics whose interval starts exactly at startDate.
      options.strictEndDatebooleanNoIf true, includes only statistics whose interval ends exactly at endDate.
      options.statisticsOptionsHealthStatisticsOptions[] or single optionNoThe list of statistics to compute. Can include: "cumulativeSum", "discreteAverage", "discreteMin", "discreteMax", "mostRecent", "duration", "separateBySource"
      options.anchorDateDateYesThe anchor date used to align intervals. For example, use midnight to align daily intervals to calendar days.
      options.intervalComponentsDateComponentsYesDefines the interval for grouping data (e.g., day, week, month). Create using new DateComponents({ day: 1 }), etc.

      Return Value

      Returns a Promise that resolves to a HealthStatisticsCollection object. This collection includes statistics for each time interval between the start and end dates, aligned by the anchor date and grouped using the provided intervalComponents.

      Example: Retrieve Daily Step Count Statistics for the Past 7 Days

      const now = new Date()
const sevenDaysAgo = new Date(now.getTime() - 7 * 24 * 60 * 60 * 1000)

const collection = await Health.queryStatisticsCollection("stepCount", {
  startDate: sevenDaysAgo,
  endDate: now,
  anchorDate: new Date(), // typically midnight today
  intervalComponents: new DateComponents({ day: 1 }),
  statisticsOptions: ["cumulativeSum"]
})

const stats = collection.statistics()
for (const stat of stats) {
  const steps = stat.sumQuantity(HealthUnit.count())
  console.log(`From ${stat.startDate.toDateString()}: ${steps} steps`)
}

      Notes

      • If no data exists for a specific interval, its corresponding HealthStatistics entry may return null values.
      • Intervals are aligned using the anchorDate, and the grouping is defined by intervalComponents.
      • If you only need overall statistics for the full range without interval grouping, use Health.queryStatistics() instead.