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Scientists measure the depth of someone's depression using something named the Hamilton scale, which was invented by a scientist named Max Hamilton in 1959. The Hamilton scale ranges from 0 (where you're skipping along merrily) to 51 (where you're jumping in front of trains). To give you a yardstick: you can get a six-point leap in your Hamilton score if you improve your sleeping patterns. What Irving found is that, in the real data that hadn't been run through a PR filter, antidepressants do cause an improvement in the Hamilton score--they do make depressed people feel better. It's an improvement of 1.8 points.