"No - I mean, that's true, it is unlikely," Ted answers, but he hadn't intended to be quite so condescending. "I was just wondering how many much more worrying things you'd noticed before, and everything had worked out fine."

If you just base it on bland statistics, it probably doesn't help, given all the things Sherlock's noticing. But if you compare it to other times he's noticed worrying things, then maybe that helps a little bit.