condition mean min max ZT0-3 23.9483 23.5825 24.3141 ZT4-7 31.3131 31.3131 31.3131 ZT8-11 36.49425 36.49425 36.49425 ZT12-15 0 0 0 ZT16-19 32.445 32.445 32.445 ZT20-23 33.2901 33.2901 33.2901