condition mean min max ZT0-3 1.5858688333333333 1.0185765 2.060105 ZT4-7 0.6504205000000001 0.6504205000000001 0.6504205000000001 ZT8-11 1.67856 1.67856 1.67856 ZT12-15 1.5907572500000002 0.3899495 2.7915650000000003 ZT16-19 3.48016 3.48016 3.48016 ZT20-23 4.03604 4.03604 4.03604