diff --git a/src/adiar/internal/algorithms/nested_sweeping.h b/src/adiar/internal/algorithms/nested_sweeping.h
index a95fb68f3..855a96f9a 100644
--- a/src/adiar/internal/algorithms/nested_sweeping.h
+++ b/src/adiar/internal/algorithms/nested_sweeping.h
@@ -1691,6 +1691,18 @@ namespace adiar::internal
 
         outer_writer.detach();
 
+#ifdef ADIAR_STATS
+        nested_sweeping::stats.inner_down.inputs.acc_size   += outer_file->size();
+        nested_sweeping::stats.inner_down.inputs.max_size    = std::max<uintwide>(nested_sweeping::stats.inner_down.inputs.max_size,
+                                                                                  outer_file->size());
+        nested_sweeping::stats.inner_down.inputs.acc_width  += outer_file->width;
+        nested_sweeping::stats.inner_down.inputs.max_width   = std::max<uintwide>(nested_sweeping::stats.inner_down.inputs.max_width,
+                                                                                  outer_file->width);
+        nested_sweeping::stats.inner_down.inputs.acc_levels += outer_file->levels();
+        nested_sweeping::stats.inner_down.inputs.max_levels  = std::max<uintwide>(nested_sweeping::stats.inner_down.inputs.max_levels,
+                                                                                  outer_file->levels());
+#endif
+
         // TODO (optimisation): is_last_inner && !non_gc_request
         //   Use a simpler (and hence faster?) algorithm for a GC-only sweep.
 
diff --git a/src/adiar/statistics.cpp b/src/adiar/statistics.cpp
index 35962c83f..42178f034 100644
--- a/src/adiar/statistics.cpp
+++ b/src/adiar/statistics.cpp
@@ -783,22 +783,57 @@ namespace adiar
       o << indent << bold_on << "inner down sweep" << bold_off << endl;
       indent_level++;
 
+      o << indent << bold_on << "inputs" << bold_off << endl;
+
+      indent_level++;
+
+      o << indent << "size" << endl;
+
+      indent_level++;
+      o << indent << label << "accumulated"
+        << internal::nested_sweeping::stats.inner_down.inputs.acc_size << endl;
+      o << indent << label << "maximum"
+        << internal::nested_sweeping::stats.inner_down.inputs.max_size << endl;
+      indent_level--;
+
+      o << indent << "width" << endl;
+
+      indent_level++;
+      o << indent << label << "accumulated"
+        << internal::nested_sweeping::stats.inner_down.inputs.acc_width << endl;
+      o << indent << label << "maximum"
+        << internal::nested_sweeping::stats.inner_down.inputs.max_width << endl;
+      indent_level--;
+
+      o << indent << "levels" << endl;
+
+      indent_level++;
+      o << indent << label << "accumulated"
+        << internal::nested_sweeping::stats.inner_down.inputs.acc_levels << endl;
+      o << indent << label << "maximum"
+        << internal::nested_sweeping::stats.inner_down.inputs.max_levels << endl;
+      indent_level--;
+
+      indent_level--;
+
+      o << indent << endl;
+
       const uintwide total_arcs = internal::nested_sweeping::stats.inner_up.outer_arcs
-                                + internal::nested_sweeping::stats.inner_up.inner_arcs;
+        + internal::nested_sweeping::stats.inner_up.inner_arcs;
 
-      o << indent << bold_on << label << "arc types" << bold_off
+      o << indent << bold_on << label << "output origin (arcs)" << bold_off
         << total_arcs
         << endl;
 
       indent_level++;
 
-      o << indent << label << "outer"
+      o << indent << label << "outer sweep"
         << internal::nested_sweeping::stats.inner_up.outer_arcs
         << " = "  << internal::percent_frac(internal::nested_sweeping::stats.inner_up.outer_arcs,
                                             total_arcs) << percent
         << endl;
 
-      o << indent << label << "inner"
+      o << indent << label << "inner sweep"
         << internal::nested_sweeping::stats.inner_up.inner_arcs
         << " = "  << internal::percent_frac(internal::nested_sweeping::stats.inner_up.inner_arcs,
                                             total_arcs) << percent
diff --git a/src/adiar/statistics.h b/src/adiar/statistics.h
index 76fd327f2..9599a602d 100644
--- a/src/adiar/statistics.h
+++ b/src/adiar/statistics.h
@@ -564,7 +564,42 @@ namespace adiar
       ////////////////////////////////////////////////////////////////////////
       struct inner_down_t
       {
-        // TODO: before/after
+        struct inputs_t
+        {
+          //////////////////////////////////////////////////////////////////////
+          /// \brief Accumulated size of all diagrams handed over to nested
+          ///        sweeps.
+          //////////////////////////////////////////////////////////////////////
+          uintwide acc_size = 0;
+
+          //////////////////////////////////////////////////////////////////////
+          /// \brief Size of the largest diagram handed over to a nested sweep.
+          //////////////////////////////////////////////////////////////////////
+          uintwide max_size = 0;
+
+          //////////////////////////////////////////////////////////////////////
+          /// \brief Accumulated width of all diagrams handed over to nested
+          ///        sweeps.
+          //////////////////////////////////////////////////////////////////////
+          uintwide acc_width = 0;
+
+          //////////////////////////////////////////////////////////////////////
+          /// \brief Largest width of any diagram handed over to a nested sweep.
+          //////////////////////////////////////////////////////////////////////
+          uintwide max_width = 0;
+
+          //////////////////////////////////////////////////////////////////////
+          /// \brief Accumulated number of levels of all diagrams handed over
+          ///        to nested sweeps.
+          //////////////////////////////////////////////////////////////////////
+          uintwide acc_levels = 0;
+
+          //////////////////////////////////////////////////////////////////////
+          /// \brief The largest number of levels handed over to a nested sweep,
+          ///        i.e. the depth of the "deepest" diagram.
+          //////////////////////////////////////////////////////////////////////
+          uintwide max_levels = 0;
+        } inputs;
 
         struct requests_t
         {