condition mean min max ZT0-3 3.4346275 2.84028 4.028975 ZT4-7 3.397605 3.397605 3.397605 ZT8-11 3.39841 3.39841 3.39841 ZT12-15 0 0 0 ZT16-19 5.144515 5.144515 5.144515 ZT20-23 6.056145 6.056145 6.056145