condition mean min max ZT0-3 20.69975 20.69975 20.69975 ZT4-7 17.44045 17.44045 17.44045 ZT8-11 41.774550000000005 41.774550000000005 41.774550000000005 ZT12-15 41.233999999999995 41.233999999999995 41.233999999999995 ZT16-19 35.92795 35.92795 35.92795 ZT20-23 22.38135 22.38135 22.38135