condition mean min max ZT0-3 1494.031279 1494.031279 1494.031279 ZT4-7 1815.8595715 1815.8595715 1815.8595715 ZT8-11 2377.6776655000003 2377.6776655000003 2377.6776655000003 ZT12-15 2321.5677775 2321.5677775 2321.5677775 ZT16-19 1454.0743045 1454.0743045 1454.0743045 ZT20-23 980.6319525 980.6319525 980.6319525