condition mean min max ZT0-3 2280.605462 2280.605462 2280.605462 ZT4-7 2102.3267115 2102.3267115 2102.3267115 ZT8-11 2209.5068300000003 2209.5068300000003 2209.5068300000003 ZT12-15 2548.5141464999997 2548.5141464999997 2548.5141464999997 ZT16-19 2209.597441 2209.597441 2209.597441 ZT20-23 2576.4243644999997 2576.4243644999997 2576.4243644999997