condition mean min max ZT0-3 1.74165 1.74165 1.74165 ZT4-7 0.48469550000000006 0.48469550000000006 0.48469550000000006 ZT8-11 0.7168935000000001 0.7168935000000001 0.7168935000000001 ZT12-15 1.73038 1.73038 1.73038 ZT16-19 3.04293 3.04293 3.04293 ZT20-23 2.88975 2.88975 2.88975