condition mean min max ZT0-3 0.60414775 0.469332 0.7389635 ZT4-7 1.91196 1.91196 1.91196 ZT8-11 2.507535 2.507535 2.507535 ZT12-15 0 0 0 ZT16-19 0.9032830000000001 0.9032830000000001 0.9032830000000001 ZT20-23 1.5983450000000001 1.5983450000000001 1.5983450000000001