condition mean min max ZT0-3 14.932223 14.932223 14.932223 ZT4-7 13.369988 13.369988 13.369988 ZT8-11 14.528047 14.528047 14.528047 ZT12-15 17.5659285 17.5659285 17.5659285 ZT16-19 14.002557 14.002557 14.002557 ZT20-23 15.976266500000001 15.976266500000001 15.976266500000001