condition mean min max ZT0-3 56.47205 56.47205 56.47205 ZT4-7 39.63205 39.63205 39.63205 ZT8-11 37.0629 37.0629 37.0629 ZT12-15 37.12925 37.12925 37.12925 ZT16-19 55.500299999999996 55.500299999999996 55.500299999999996 ZT20-23 61.7753 61.7753 61.7753