The March Madness pain index

The support group for 66 fan bases has returned.

The Duke Blue Devils and Villanova Wildcats were the latest to join the March Madness list that will ultimately include every team but one, the group of NCAA tournament teams destined to end otherwise fine seasons with a loss. Either the Kansas Jayhawks or North Carolina Tar Heels will join this list Monday night, and the feeling is not destined to be pleasant.

Every team’s exit from the tournament has its own distinctive story, but some are undoubtedly tougher to swallow than others, so we sought to quantify the disappointment. Here are the main factors we considered in measuring the March Madness pain:

• Did your team squander a game it looked like it had won? ESPN’s win probability data helped determine the appropriate level of devastation here.

• Did your team squander a golden opportunity against a perceived lesser opponent?

• Did your team come up short in a bid to make some kind of history? First NCAA win/Sweet 16/Final Four in a long time is what we were seeking here.

• Was it the end of an era? Did your team have a group of seniors known to be departing? A coach on the move or headed toward retirement?

We considered those factors and stacked the L’s. If you’re a fan of a team on this list, read along and take comfort in the notion that misery will always love company.

66. Texas Southern Tigers (No. 16 seed, Midwest)

How they lost: No. 1 seed Kansas defeated the Tigers 83-56 in the first round

Peak win probability: 5.0% (Texas Southern 2, Kansas 0 at 17:58 mark of first half)

How much it hurt: Texas Southern continued its mastery of the First Four, taking down Texas A&M-Corpus Christi in Dayton to advance to the round of 64 for a second straight year. Once there, the Tigers struggled to keep pace with the Jayhawks as expected, getting caught on the business end of a 28-7 run to close the first half and pretty much end the dream. TSU trailed by 28 at the break, and it was academic from there for eventual national championship…