condition mean min max ZT0-3 2.9630725 2.84676 3.0793850000000003 ZT4-7 3.444275 3.444275 3.444275 ZT8-11 1.95547 1.95547 1.95547 ZT12-15 0 0 0 ZT16-19 2.758305 2.758305 2.758305 ZT20-23 2.58527 2.58527 2.58527