# enumerateStatistics(from:to:with:) Enumerates the statistics objects for all the time intervals from the start date until the end date. ``` func enumerateStatistics(from startDate: Date, to endDate: Date, with block: @escaping (HKStatistics, UnsafeMutablePointer) -> Void) ``` ## Parameters `startDate` The start date for the calculation. The initial statistics come from the time interval that contains the start date. `endDate` The end date for the calculation. The final statistics come from the time interval that contains the end date. `block` A block that is called once for each time interval. This method passes the following parameters to the block: - result: The [`HKStatistics`](/documentation/HealthKit/HKStatistics) object containing the statistical data for this time interval. - stop: A reference to a Boolean value. The block can set the value to to stop further processing of the collection. The stop argument is an out-only argument. Only set this Boolean to within the block. ## Discussion This method enumerates the statistics in chronological order. It calls the block once for each time interval between the start and end dates. If there are no samples for a particular time interval, the corresponding statistic object has a `nil`-valued quantity. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)