condition mean min max ZT0-3 56.099999999999994 56.099999999999994 56.099999999999994 ZT4-7 41.9 41.9 41.9 ZT8-11 34.7 34.7 34.7 ZT12-15 29.049999999999997 29.049999999999997 29.049999999999997 ZT16-19 57.25 57.25 57.25 ZT20-23 53.65 53.65 53.65