condition mean min max ZT0-3 18.85 18.85 18.85 ZT4-7 70.1 70.1 70.1 ZT8-11 57.8 57.8 57.8 ZT12-15 61.699999999999996 61.699999999999996 61.699999999999996 ZT16-19 26.25 26.25 26.25 ZT20-23 33.3 33.3 33.3