condition mean min max ZT0-3 27.435425 24.644 30.22685 ZT4-7 24.03685 24.03685 24.03685 ZT8-11 28.89785 28.89785 28.89785 ZT12-15 0 0 0 ZT16-19 34.68575 34.68575 34.68575 ZT20-23 24.8539 24.8539 24.8539