condition mean min max ZT0-3 61.7 61.7 61.7 ZT4-7 27.0 27.0 27.0 ZT8-11 44.699999999999996 44.699999999999996 44.699999999999996 ZT12-15 67.9 67.9 67.9 ZT16-19 37.7 37.7 37.7 ZT20-23 36.3 36.3 36.3