condition mean min max ZT0-3 13.744762803 9.947554466 17.54197114 ZT4-7 17.8515013425 17.175883265 18.52711942 ZT8-11 27.6389320425 20.207974635 35.06988945 ZT12-15 49.632074575 45.45774888 53.80640027 ZT16-19 49.512895137499996 47.64964685 51.376143424999995 ZT20-23 27.2717510025 24.086756525000002 30.45674548