condition mean min max ZT0-3 0.2814337666666667 0.0269743 0.5174195 ZT4-7 0.21712749999999997 0.21712749999999997 0.21712749999999997 ZT8-11 8.8608 8.8608 8.8608 ZT12-15 0.4193515 0.40871199999999996 0.429991 ZT16-19 0.23790994999999998 0.23790994999999998 0.23790994999999998 ZT20-23 0.2644595 0.2644595 0.2644595