condition mean min max ZT0-3 3.79513 3.165465 4.424795 ZT4-7 2.255615 2.255615 2.255615 ZT8-11 1.6022150000000002 1.6022150000000002 1.6022150000000002 ZT12-15 0 0 0 ZT16-19 2.6393649999999997 2.6393649999999997 2.6393649999999997 ZT20-23 2.938355 2.938355 2.938355