condition mean min max ZT0-3 383.250529 383.250529 383.250529 ZT4-7 344.520886 344.520886 344.520886 ZT8-11 331.6938165 331.6938165 331.6938165 ZT12-15 328.60719 328.60719 328.60719 ZT16-19 393.45260199999996 393.45260199999996 393.45260199999996 ZT20-23 384.274444 384.274444 384.274444