condition mean min max ZT0-3 35.2626636575 32.947187625 37.57813969 ZT4-7 24.46013456 23.2719937 25.648275419999997 ZT8-11 32.1162337025 28.014107744999997 36.21835966 ZT12-15 22.2098978925 18.609145145 25.81065064 ZT16-19 14.296283505 13.61658478 14.97598223 ZT20-23 14.771970759999999 14.140120625 15.403820894999999