condition mean min max ZT0-3 43.729043 43.729043 43.729043 ZT4-7 48.6045065 48.6045065 48.6045065 ZT8-11 44.2186525 44.2186525 44.2186525 ZT12-15 41.4086885 41.4086885 41.4086885 ZT16-19 43.803581 43.803581 43.803581 ZT20-23 40.693529 40.693529 40.693529