condition mean min max ZT0-3 94.768127 94.768127 94.768127 ZT4-7 92.161575 92.161575 92.161575 ZT8-11 119.062906 119.062906 119.062906 ZT12-15 124.961815 124.961815 124.961815 ZT16-19 113.850481 113.850481 113.850481 ZT20-23 118.5208405 118.5208405 118.5208405