condition mean min max ZT0-3 134.8049 134.8049 134.8049 ZT4-7 269.9717 269.9717 269.9717 ZT8-11 350.43989999999997 350.43989999999997 350.43989999999997 ZT12-15 24.036016666666665 24.036016666666665 24.036016666666665 ZT16-19 24.39395 24.39395 24.39395 ZT20-23 159.92125 159.92125 159.92125