condition mean min max ZT0-3 19.114538 19.114538 19.114538 ZT4-7 17.504811 17.504811 17.504811 ZT8-11 14.0150255 14.0150255 14.0150255 ZT12-15 47.423677500000004 47.423677500000004 47.423677500000004 ZT16-19 14.515731500000001 14.515731500000001 14.515731500000001 ZT20-23 18.42991 18.42991 18.42991