condition mean min max ZT0-3 0.250305 0.250305 0.250305 ZT4-7 0.49328249999999996 0.49328249999999996 0.49328249999999996 ZT8-11 0.23357499999999998 0.23357499999999998 0.23357499999999998 ZT12-15 0.04534255 0.04534255 0.04534255 ZT16-19 0.190954 0.190954 0.190954 ZT20-23 0.31284350000000005 0.31284350000000005 0.31284350000000005