condition mean min max ZT0-3 0.6833681666666667 0.531571 0.7666615 ZT4-7 1.565085 1.565085 1.565085 ZT8-11 0.7024675 0.7024675 0.7024675 ZT12-15 1.14949025 0.7780905 1.52089 ZT16-19 0.595491 0.595491 0.595491 ZT20-23 0.6884465 0.6884465 0.6884465