condition mean min max ZT0-3 19.73775 19.73775 19.73775 ZT4-7 14.57575 14.57575 14.57575 ZT8-11 13.8825 13.8825 13.8825 ZT12-15 22.94155 22.94155 22.94155 ZT16-19 24.6373 24.6373 24.6373 ZT20-23 25.5968 25.5968 25.5968