condition mean min max ZT0-3 214.712393 214.712393 214.712393 ZT4-7 108.8974125 108.8974125 108.8974125 ZT8-11 105.795751 105.795751 105.795751 ZT12-15 169.57203700000002 169.57203700000002 169.57203700000002 ZT16-19 194.587602 194.587602 194.587602 ZT20-23 94.067611 94.067611 94.067611