condition mean min max ZT0-3 2.4568325 2.338475 2.57519 ZT4-7 3.41331 3.41331 3.41331 ZT8-11 10.23189 10.23189 10.23189 ZT12-15 0 0 0 ZT16-19 8.37485 8.37485 8.37485 ZT20-23 5.360305 5.360305 5.360305