condition mean min max ZT0-3 1.9832325 1.78281 2.183655 ZT4-7 2.12251 2.12251 2.12251 ZT8-11 2.13842 2.13842 2.13842 ZT12-15 0 0 0 ZT16-19 3.10457 3.10457 3.10457 ZT20-23 3.217635 3.217635 3.217635