condition mean min max ZT0-3 13.901575000000001 12.0726 15.730550000000001 ZT4-7 7.955495 7.955495 7.955495 ZT8-11 7.34292 7.34292 7.34292 ZT12-15 0 0 0 ZT16-19 14.7463 14.7463 14.7463 ZT20-23 14.90135 14.90135 14.90135