condition mean min max ZT0-3 28.5926 28.5926 28.5926 ZT4-7 19.29385 19.29385 19.29385 ZT8-11 25.4758 25.4758 25.4758 ZT12-15 25.9375 25.9375 25.9375 ZT16-19 41.27345 41.27345 41.27345 ZT20-23 34.71225 34.71225 34.71225