condition mean min max ZT0-3 37.814750000000004 37.814750000000004 37.814750000000004 ZT4-7 27.28895 27.28895 27.28895 ZT8-11 26.533749999999998 26.533749999999998 26.533749999999998 ZT12-15 29.9107 29.9107 29.9107 ZT16-19 35.5489 35.5489 35.5489 ZT20-23 38.726600000000005 38.726600000000005 38.726600000000005