condition mean min max ZT0-3 10.87645 10.87645 10.87645 ZT4-7 7.71331 7.71331 7.71331 ZT8-11 7.24735 7.24735 7.24735 ZT12-15 9.339205 9.339205 9.339205 ZT16-19 11.695350000000001 11.695350000000001 11.695350000000001 ZT20-23 12.0239 12.0239 12.0239