condition mean min max ZT0-3 2.213345 2.213345 2.213345 ZT4-7 1.2015354999999999 1.2015354999999999 1.2015354999999999 ZT8-11 3.2475449999999997 3.2475449999999997 3.2475449999999997 ZT12-15 4.42797 4.42797 4.42797 ZT16-19 7.949145 7.949145 7.949145 ZT20-23 2.5461650000000002 2.5461650000000002 2.5461650000000002