condition mean min max ZT0-3 13.45563 11.360809999999999 15.55045 ZT4-7 3.2738300000000002 3.2738300000000002 3.2738300000000002 ZT8-11 3.4968200000000005 3.4968200000000005 3.4968200000000005 ZT12-15 0 0 0 ZT16-19 8.02401 8.02401 8.02401 ZT20-23 6.5247399999999995 6.5247399999999995 6.5247399999999995