Statistical (item count) information on the condition of items that match the search criteria (or specified category). For example, the number of brand new items that match the query.
Each conditionHistogram specifies one condition and the number of matching items found. The list of all conditionHistogram containers returned represents the union of all conditions that were found in the item results. For example, if items were found in different categories, and if those categories support different sets of item conditions, then all those conditions are returned in the list, regardless of category.
If multiple items use the same condition ID, but some items use different display names for that condition, the histogram shows the site's default display name for that condition. This means that the condition name in a histogram may not always exactly match the condition names on the counted items.
See the Field Index to learn which calls use conditionHistogram.