condition mean min max ZT0-3 11.458205 10.116109999999999 12.8003 ZT4-7 4.673205 4.673205 4.673205 ZT8-11 2.92188 2.92188 2.92188 ZT12-15 0 0 0 ZT16-19 7.837255000000001 7.837255000000001 7.837255000000001 ZT20-23 13.2516 13.2516 13.2516