condition mean min max ZT0-3 12.6418 12.53345 12.750150000000001 ZT4-7 6.25924 6.25924 6.25924 ZT8-11 6.460125 6.460125 6.460125 ZT12-15 0 0 0 ZT16-19 11.829550000000001 11.829550000000001 11.829550000000001 ZT20-23 8.61415 8.61415 8.61415