- The busier the person, the less likely they are to be late.
- The closer the person's office to the meeting room, the more likely they are to be late to the meeting.
- Small meetings can have convergence problems, just like maximum likelihood estimations (gotta have some econometrics background to fully appreciate this one).
- If you are always late, it's not an accident.
- Lateness is ingrained, as a social convention.
I'd also add a sixth one: "The person who's always on time for meetings is more productive than the one who's chronically late." The inability to self-disipline yourself to do something as simple as making it to a meeting on time is a very good predictor of self-displine in other areas.
And self-disipline (not intelligence, training, or anything else) is IMO the single most important factor in being productive.