condition mean min max ZT0-3 20.28896891 13.09006542 27.4878724 ZT4-7 35.4722889425 31.26699563 39.677582255000004 ZT8-11 35.4032637025 33.84289629 36.963631115 ZT12-15 18.403994984999997 13.360711315 23.447278654999998 ZT16-19 8.291281207 8.1605455465 8.4220168675 ZT20-23 7.3582381115 6.1256646065 8.5908116165