condition mean min max ZT0-3 191.24665 107.37295 239.172 ZT4-7 77.69579999999999 77.69579999999999 77.69579999999999 ZT8-11 247.33100000000002 247.33100000000002 247.33100000000002 ZT12-15 230.63524999999998 206.5005 254.76999999999998 ZT16-19 234.05700000000002 234.05700000000002 234.05700000000002 ZT20-23 254.982 254.982 254.982