diff -r 100eee4adc4c perf.py
--- a/perf.py	Tue Oct 28 20:10:14 2014 +0100
+++ b/perf.py	Sun Nov 16 10:44:28 2014 +0100
@@ -423,14 +423,19 @@
 class BenchmarkResult(object):
     """An object representing data from a succesful benchmark run."""
 
-    def __init__(self, min_base, min_changed, delta_min, avg_base,
-                 avg_changed, delta_avg, t_msg, std_base, std_changed,
-                 delta_std, is_significant, timeline_link):
+    def __init__(self, min_base, min_changed, delta_min,
+                 avg_base, avg_changed, delta_avg, t_msg,
+                 std_base, std_changed, delta_std,
+                 med_base, med_changed, delta_med,
+                 is_significant, timeline_link):
         self.min_base      = min_base
         self.min_changed   = min_changed
         self.delta_min     = delta_min
         self.avg_base      = avg_base
         self.avg_changed   = avg_changed
+        self.med_base      = med_base
+        self.med_changed   = med_changed
+        self.delta_med     = delta_med
         self.delta_avg     = delta_avg
         self.t_msg         = t_msg
         self.std_base      = std_base
@@ -447,6 +452,8 @@
     def __str__(self):
         return (("Min: %(min_base)f -> %(min_changed)f:" +
                  " %(delta_min)s\n" +
+                 "Med: %(med_base)f -> %(med_changed)f:" +
+                 " %(delta_med)s\n" +
                  "Avg: %(avg_base)f -> %(avg_changed)f:" +
                  " %(delta_avg)s\n" + self.t_msg +
                  "Stddev: %(std_base).5f -> %(std_changed).5f:" +
@@ -1033,9 +1040,12 @@
 
     min_base, min_changed = base_times[0], changed_times[0]
     avg_base, avg_changed = avg(base_times), avg(changed_times)
+    med_base = base_times[len(base_times)//2]
+    med_changed = changed_times[len(changed_times)//2]
     std_base = SampleStdDev(base_times)
     std_changed = SampleStdDev(changed_times)
     delta_min = TimeDelta(min_base, min_changed)
+    delta_med = TimeDelta(med_base, med_changed)
     delta_avg = TimeDelta(avg_base, avg_changed)
     delta_std = QuantityDelta(std_base, std_changed)
 
@@ -1049,9 +1059,11 @@
         if significant:
             t_msg = "Significant (t=%.2f)\n" % t_score
 
-    return BenchmarkResult(min_base, min_changed, delta_min, avg_base,
-                           avg_changed, delta_avg, t_msg, std_base,
-                           std_changed, delta_std, significant, timeline_link)
+    return BenchmarkResult(min_base, min_changed, delta_min,
+                           avg_base, avg_changed, delta_avg, t_msg,
+                           std_base, std_changed, delta_std,
+                           med_base, med_changed, delta_med,
+                           significant, timeline_link)
 
 
 def CompareBenchmarkData(base_data, exp_data, options):