condition mean min max ZT0-3 0.8979651666666667 0.638282 1.178665 ZT4-7 0.6460585 0.6460585 0.6460585 ZT8-11 0.672415 0.672415 0.672415 ZT12-15 1.11495275 1.0110605000000001 1.218845 ZT16-19 1.301415 1.301415 1.301415 ZT20-23 1.58931 1.58931 1.58931