condition mean min max ZT0-3 12.088175 11.9648 12.211549999999999 ZT4-7 16.03835 16.03835 16.03835 ZT8-11 14.5994 14.5994 14.5994 ZT12-15 0 0 0 ZT16-19 16.58425 16.58425 16.58425 ZT20-23 15.87145 15.87145 15.87145