condition mean min max ZT0-3 9.125544999999999 7.775065 10.476025 ZT4-7 11.51735 11.51735 11.51735 ZT8-11 12.46595 12.46595 12.46595 ZT12-15 0 0 0 ZT16-19 16.2242 16.2242 16.2242 ZT20-23 15.99565 15.99565 15.99565