condition mean min max ZT0-3 223.361372 223.361372 223.361372 ZT4-7 218.3834425 218.3834425 218.3834425 ZT8-11 335.009375 335.009375 335.009375 ZT12-15 235.91671000000002 235.91671000000002 235.91671000000002 ZT16-19 340.3376225 340.3376225 340.3376225 ZT20-23 295.74631899999997 295.74631899999997 295.74631899999997