condition mean min max ZT0-3 213.189093 213.189093 213.189093 ZT4-7 227.265694 227.265694 227.265694 ZT8-11 236.755907 236.755907 236.755907 ZT12-15 260.37165200000004 260.37165200000004 260.37165200000004 ZT16-19 316.5325835 316.5325835 316.5325835 ZT20-23 336.2504755 336.2504755 336.2504755