condition mean min max ZT0-3 2.56161 2.56161 2.56161 ZT4-7 1.97005 1.97005 1.97005 ZT8-11 1.366145 1.366145 1.366145 ZT12-15 1.65266 1.65266 1.65266 ZT16-19 3.4546 3.4546 3.4546 ZT20-23 2.584535 2.584535 2.584535