condition mean min max ZT0-3 1.08192975 0.7293045 1.434555 ZT4-7 6.31306 6.31306 6.31306 ZT8-11 1.525825 1.525825 1.525825 ZT12-15 0 0 0 ZT16-19 0.05974045 0.05974045 0.05974045 ZT20-23 0.15022950000000002 0.15022950000000002 0.15022950000000002