One of the very hard to quantify effects here are how many of the bugs found in 'short' routines would have gone unnoticed if the routines were longer. In other

One of the very hard to quantify effects here are how many of the bugs found in 'short' routines would have gone unnoticed if the routines were longer. In other words, were all the bugs that were there (both in short and in long functions) actually found? In trivial flow (short routine) bugs tend to stand out whereas in complex flow (longer routine with multiple levels of nesting) bugs can be much harder to spot. It may actually be good that more errors were found in shorter routines after all that is exactly what it is about, finding errors, not making errors.