condition mean min max ZT0-3 426.385903 426.385903 426.385903 ZT4-7 606.7845545 606.7845545 606.7845545 ZT8-11 611.555451 611.555451 611.555451 ZT12-15 529.255784 529.255784 529.255784 ZT16-19 474.423426 474.423426 474.423426 ZT20-23 311.9024945 311.9024945 311.9024945