condition mean min max ZT0-3 587.386948 587.386948 587.386948 ZT4-7 675.5272715 675.5272715 675.5272715 ZT8-11 510.551517 510.551517 510.551517 ZT12-15 538.5020314999999 538.5020314999999 538.5020314999999 ZT16-19 721.2652085 721.2652085 721.2652085 ZT20-23 345.2249505 345.2249505 345.2249505