condition mean min max ZT0-3 1.27545 0.817957 1.732943 ZT4-7 6.146755 6.146755 6.146755 ZT8-11 4.065135 4.065135 4.065135 ZT12-15 0 0 0 ZT16-19 2.1883049999999997 2.1883049999999997 2.1883049999999997 ZT20-23 3.865165 3.865165 3.865165