condition mean min max ZT0-3 37.469425 32.232749999999996 42.7061 ZT4-7 22.197899999999997 22.197899999999997 22.197899999999997 ZT8-11 12.52085 12.52085 12.52085 ZT12-15 0 0 0 ZT16-19 15.02055 15.02055 15.02055 ZT20-23 23.5764 23.5764 23.5764