condition mean min max ZT0-3 24.053783333333335 20.28855 28.770400000000002 ZT4-7 26.522399999999998 26.522399999999998 26.522399999999998 ZT8-11 29.27935 29.27935 29.27935 ZT12-15 51.641225 50.5286 52.75385 ZT16-19 38.29345 38.29345 38.29345 ZT20-23 37.245450000000005 37.245450000000005 37.245450000000005