condition mean min max ZT0-3 0.0061545 0.0061545 0.0061545 ZT4-7 0.0396628 0.0396628 0.0396628 ZT8-11 0.08397025 0.08397025 0.08397025 ZT12-15 0.043862250000000005 0.043862250000000005 0.043862250000000005 ZT16-19 0.037952200000000005 0.037952200000000005 0.037952200000000005 ZT20-23 0.07046736666666667 0.07046736666666667 0.07046736666666667