condition mean min max ZT0-3 88.064566 88.064566 88.064566 ZT4-7 41.915349500000005 41.915349500000005 41.915349500000005 ZT8-11 29.7704895 29.7704895 29.7704895 ZT12-15 34.624055999999996 34.624055999999996 34.624055999999996 ZT16-19 30.4360785 30.4360785 30.4360785 ZT20-23 29.2371175 29.2371175 29.2371175