condition mean min max ZT0-3 2.522235 2.34577 2.6986999999999997 ZT4-7 2.34239 2.34239 2.34239 ZT8-11 2.2235449999999997 2.2235449999999997 2.2235449999999997 ZT12-15 0 0 0 ZT16-19 2.604725 2.604725 2.604725 ZT20-23 2.491985 2.491985 2.491985