condition mean min max ZT0-3 34.182925 32.00995 36.3559 ZT4-7 27.25345 27.25345 27.25345 ZT8-11 25.65315 25.65315 25.65315 ZT12-15 0 0 0 ZT16-19 28.326349999999998 28.326349999999998 28.326349999999998 ZT20-23 31.74555 31.74555 31.74555