condition mean min max ZT0-3 4.4917075 4.348575 4.6348400000000005 ZT4-7 4.616185 4.616185 4.616185 ZT8-11 5.3718 5.3718 5.3718 ZT12-15 0 0 0 ZT16-19 5.948525 5.948525 5.948525 ZT20-23 5.44913 5.44913 5.44913