condition mean min max ZT0-3 373.491328 373.491328 373.491328 ZT4-7 213.22940599999998 213.22940599999998 213.22940599999998 ZT8-11 218.70398699999998 218.70398699999998 218.70398699999998 ZT12-15 277.8908495 277.8908495 277.8908495 ZT16-19 328.1803585 328.1803585 328.1803585 ZT20-23 312.269407 312.269407 312.269407