condition mean min max ZT0-3 3.3305599999999997 3.1029549999999997 3.558165 ZT4-7 5.094620000000001 5.094620000000001 5.094620000000001 ZT8-11 5.052095 5.052095 5.052095 ZT12-15 0 0 0 ZT16-19 5.2243949999999995 5.2243949999999995 5.2243949999999995 ZT20-23 6.020435 6.020435 6.020435