condition mean min max ZT0-3 0.452094 0.244749 0.659439 ZT4-7 0.6689080000000001 0.6689080000000001 0.6689080000000001 ZT8-11 2.02166 2.02166 2.02166 ZT12-15 0 0 0 ZT16-19 2.40439 2.40439 2.40439 ZT20-23 0.9373279999999999 0.9373279999999999 0.9373279999999999