condition mean min max ZT0-3 352.847441 352.847441 352.847441 ZT4-7 393.815714 393.815714 393.815714 ZT8-11 515.7494715 515.7494715 515.7494715 ZT12-15 536.3437895 536.3437895 536.3437895 ZT16-19 446.392934 446.392934 446.392934 ZT20-23 406.9447215 406.9447215 406.9447215