condition mean min max ZT0-3 3577.208482 3577.208482 3577.208482 ZT4-7 3761.4993475 3761.4993475 3761.4993475 ZT8-11 2989.4869360000002 2989.4869360000002 2989.4869360000002 ZT12-15 3423.530412 3423.530412 3423.530412 ZT16-19 2916.53851 2916.53851 2916.53851 ZT20-23 2952.9933005000003 2952.9933005000003 2952.9933005000003