Strategy post: blind defense

[holdem2000]

I always notice that some of the players I've played thousands of hands with have defended their SB from steals a lot more than their BB (most of these players defend their BB less than 10% of the time but their SB 20-30% of the time). I'm wondering if these statistics are popping up entirely randomly (i.e., while these players have a smaller range they play with from the SB, I have so many of these opponents who I've only played a few thousand hands with that randomly I'll see a few defend the SB more until I get much larger samples), or if a few of them deliberately do defend their SB from steals more than their BB.

So does anyone reading this defend their SB from steals more than their BB? If any data miners are reading this and could let me know whether any players in their database show this patter over a more significant sample size, I'd appreciate that too.

For those of you who do defend your SB more, what are the reasons you do this? When you defend, about how often are you calling and how often are you 3-betting?

I'm mostly looking for replies at 50NL and up, but any useful feedback is appreciated.