condition mean min max ZT0-3 15.2379 14.9164 15.5594 ZT4-7 12.52425 12.52425 12.52425 ZT8-11 13.29525 13.29525 13.29525 ZT12-15 0 0 0 ZT16-19 13.32205 13.32205 13.32205 ZT20-23 11.8372 11.8372 11.8372