condition mean min max ZT0-3 129.253424 129.253424 129.253424 ZT4-7 119.9571425 119.9571425 119.9571425 ZT8-11 112.75868700000001 112.75868700000001 112.75868700000001 ZT12-15 135.477509 135.477509 135.477509 ZT16-19 152.1041885 152.1041885 152.1041885 ZT20-23 175.0394015 175.0394015 175.0394015