in 8.8.b7:

less than 1 : 18
less than 2 : 25
less than 4 : 38
less than 8 : 41
less than 16 : 43
less than 64 : 44

In the 15 worst files, 92 broken doctests:

['src/sage/combinat/root_system/weyl_characters.py # 3 doctests failed',
'src/sage/combinat/set_partition_ordered.py # 3 doctests failed',
'src/sage/doctest/test.py # 3 doctests failed',
'src/sage/misc/sageinspect.py # 3 doctests failed',
'src/sage/rings/polynomial/multi_polynomial_ideal.py # 3 doctests failed',
'src/sage/rings/polynomial/toy_buchberger.py # 3 doctests failed',
'src/sage/matroids/graphic_matroid.py # 4 doctests failed',
'src/sage/misc/functional.py # 4 doctests failed',
'src/sage/repl/attach.py # 4 doctests failed',
'src/sage/combinat/root_system/weyl_group.py # 7 doctests failed',
'src/sage/graphs/generic_graph.py # 8 doctests failed',
'src/sage/symbolic/expression.pyx # 8 doctests failed',
'src/sage/misc/nested_class.pyx # 9 doctests failed',
'src/sage/rings/integer.pyx # 9 doctests failed',
'src/sage/matroids/matroid.pyx # 21 doctests failed']