condition mean min max ZT0-3 1243.999697 1243.999697 1243.999697 ZT4-7 1070.6930305 1070.6930305 1070.6930305 ZT8-11 825.093496 825.093496 825.093496 ZT12-15 1026.5577405 1026.5577405 1026.5577405 ZT16-19 523.6672665 523.6672665 523.6672665 ZT20-23 465.47202 465.47202 465.47202