condition mean min max ZT0-3 12.8579 11.879850000000001 13.83595 ZT4-7 13.0175 13.0175 13.0175 ZT8-11 24.49715 24.49715 24.49715 ZT12-15 0 0 0 ZT16-19 26.721 26.721 26.721 ZT20-23 15.242650000000001 15.242650000000001 15.242650000000001