condition mean min max ZT0-3 36.68535 36.68535 36.68535 ZT4-7 30.335900000000002 30.335900000000002 30.335900000000002 ZT8-11 35.612849999999995 35.612849999999995 35.612849999999995 ZT12-15 29.89085 29.89085 29.89085 ZT16-19 45.26605 45.26605 45.26605 ZT20-23 40.7919 40.7919 40.7919