4th and 1, 72% conversion rate. Article was from 2008.
I don't know what other context to add to being confident in my defense. If my defense is getting consistently shredded by the offense, I'd probably think twice, and play the field position game, but if I think there's a realistic chance we can hold them to a 3 and out, or maybe just one first down so they'll be attempting a long FG, I'm probably more likely to go for it on 4th and 1.
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