condition mean min max ZT0-3 13.698374999999999 13.66555 13.7312 ZT4-7 10.37988 10.37988 10.37988 ZT8-11 6.154005 6.154005 6.154005 ZT12-15 0 0 0 ZT16-19 10.164525000000001 10.164525000000001 10.164525000000001 ZT20-23 12.60735 12.60735 12.60735