condition mean min max ZT0-3 15.94735 15.94735 15.94735 ZT4-7 26.2846 26.2846 26.2846 ZT8-11 24.782899999999998 24.782899999999998 24.782899999999998 ZT12-15 22.6985 22.6985 22.6985 ZT16-19 29.06295 29.06295 29.06295 ZT20-23 11.230450000000001 11.230450000000001 11.230450000000001