condition mean min max ZT0-3 2661.444972 2661.444972 2661.444972 ZT4-7 761.2147695000001 761.2147695000001 761.2147695000001 ZT8-11 213.6677295 213.6677295 213.6677295 ZT12-15 238.00214649999998 238.00214649999998 238.00214649999998 ZT16-19 100.4064955 100.4064955 100.4064955 ZT20-23 66.4624555 66.4624555 66.4624555