condition mean min max ZT0-3 10.332202 10.332202 10.332202 ZT4-7 10.9432925 10.9432925 10.9432925 ZT8-11 9.685103999999999 9.685103999999999 9.685103999999999 ZT12-15 10.789297999999999 10.789297999999999 10.789297999999999 ZT16-19 12.37167 12.37167 12.37167 ZT20-23 11.449522 11.449522 11.449522