condition mean min max ZT0-3 0.06719699999999999 0.06719699999999999 0.06719699999999999 ZT4-7 0.3247895 0.3247895 0.3247895 ZT8-11 1.241786 1.241786 1.241786 ZT12-15 0.976995 0.976995 0.976995 ZT16-19 1.1328476666666667 1.1328476666666667 1.1328476666666667 ZT20-23 0.33685000000000004 0.33685000000000004 0.33685000000000004