condition mean min max ZT0-3 19.51565 19.51565 19.51565 ZT4-7 14.990549999999999 14.990549999999999 14.990549999999999 ZT8-11 17.8196 17.8196 17.8196 ZT12-15 16.281799999999997 16.281799999999997 16.281799999999997 ZT16-19 18.28485 18.28485 18.28485 ZT20-23 19.25395 19.25395 19.25395