condition mean min max ZT0-3 26.52225 26.52225 26.52225 ZT4-7 37.4989 37.4989 37.4989 ZT8-11 31.6179 31.6179 31.6179 ZT12-15 27.111849999999997 27.111849999999997 27.111849999999997 ZT16-19 18.46665 18.46665 18.46665 ZT20-23 19.54955 19.54955 19.54955