condition mean min max ZT0-3 1.5267822500000001 0.7989995 2.2545650000000004 ZT4-7 3.548165 3.548165 3.548165 ZT8-11 0.5769525 0.5769525 0.5769525 ZT12-15 0 0 0 ZT16-19 2.3520445 2.3520445 2.3520445 ZT20-23 1.69072 1.69072 1.69072