condition mean min max ZT0-3 33.1075 33.1075 33.1075 ZT4-7 26.6303 26.6303 26.6303 ZT8-11 29.804699999999997 29.804699999999997 29.804699999999997 ZT12-15 31.590049999999998 31.590049999999998 31.590049999999998 ZT16-19 37.7671 37.7671 37.7671 ZT20-23 35.528099999999995 35.528099999999995 35.528099999999995