condition mean min max ZT0-3 8.050528333333332 4.56612 11.1763 ZT4-7 4.48938 4.48938 4.48938 ZT8-11 4.66615 4.66615 4.66615 ZT12-15 11.7681825 11.577865 11.9585 ZT16-19 12.68245 12.68245 12.68245 ZT20-23 14.30485 14.30485 14.30485