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diff --git a/src/core/stat_item_internal.h b/src/core/stat_item_internal.h
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+/*! \file stat_item_internal.h
+ * internal definitions for the osmo_stat_item API */
+#pragma once
+
+/*! \addtogroup osmo_stat_item
+ *  @{
+ */
+
+struct osmo_stat_item_period {
+	/*! Number of osmo_stat_item_set() that occurred during the reporting period, zero if none. */
+	uint32_t n;
+	/*! Smallest value seen in a reporting period. */
+	int32_t min;
+	/*! Most recent value passed to osmo_stat_item_set(), or the item->desc->default_value if none. */
+	int32_t last;
+	/*! Largest value seen in a reporting period. */
+	int32_t max;
+	/*! Sum of all values passed to osmo_stat_item_set() in the reporting period. */
+	int64_t sum;
+};
+
+/*! data we keep for each actual item */
+struct osmo_stat_item {
+	/*! back-reference to the item description */
+	const struct osmo_stat_item_desc *desc;
+
+	/*! Current reporting period / current value. */
+	struct osmo_stat_item_period value;
+
+	/*! The results of the previous reporting period. According to these, the stats reporter decides whether to
+	 * re-send values or omit an unchanged value from a report. */
+	struct osmo_stat_item_period reported;
+};
+
+/*! @} */