condition mean min max ZT0-3 11.8033775 10.857655000000001 12.7491 ZT4-7 11.535 11.535 11.535 ZT8-11 9.76702 9.76702 9.76702 ZT12-15 0 0 0 ZT16-19 12.905100000000001 12.905100000000001 12.905100000000001 ZT20-23 11.09005 11.09005 11.09005