condition mean min max ZT0-3 12.691099999999999 12.691099999999999 12.691099999999999 ZT4-7 11.3261 11.3261 11.3261 ZT8-11 8.497395000000001 8.497395000000001 8.497395000000001 ZT12-15 8.63656 8.63656 8.63656 ZT16-19 11.9999 11.9999 11.9999 ZT20-23 11.22305 11.22305 11.22305