condition mean min max ZT0-3 28.667375 27.59 29.74475 ZT4-7 20.40445 20.40445 20.40445 ZT8-11 15.722850000000001 15.722850000000001 15.722850000000001 ZT12-15 0 0 0 ZT16-19 29.15175 29.15175 29.15175 ZT20-23 22.45265 22.45265 22.45265