condition mean min max ZT0-3 10.586879 10.586879 10.586879 ZT4-7 11.948961 11.948961 11.948961 ZT8-11 10.811377 10.811377 10.811377 ZT12-15 11.440147499999998 11.440147499999998 11.440147499999998 ZT16-19 10.757492 10.757492 10.757492 ZT20-23 10.226037999999999 10.226037999999999 10.226037999999999