condition mean min max ZT0-3 10.528836 10.528836 10.528836 ZT4-7 14.4930995 14.4930995 14.4930995 ZT8-11 12.722023499999999 12.722023499999999 12.722023499999999 ZT12-15 12.064417 12.064417 12.064417 ZT16-19 10.393854000000001 10.393854000000001 10.393854000000001 ZT20-23 12.4428765 12.4428765 12.4428765