condition mean min max ZT0-3 3.3018975 3.235435 3.36836 ZT4-7 14.80265 14.80265 14.80265 ZT8-11 36.3068 36.3068 36.3068 ZT12-15 0 0 0 ZT16-19 15.1955 15.1955 15.1955 ZT20-23 6.53574 6.53574 6.53574