condition mean min max ZT0-3 1110.701473 1110.701473 1110.701473 ZT4-7 1085.5712979999998 1085.5712979999998 1085.5712979999998 ZT8-11 564.999404 564.999404 564.999404 ZT12-15 2226.9189625 2226.9189625 2226.9189625 ZT16-19 1383.1221019999998 1383.1221019999998 1383.1221019999998 ZT20-23 2606.376682 2606.376682 2606.376682