condition mean min max ZT0-3 23.550418 23.550418 23.550418 ZT4-7 13.5934815 13.5934815 13.5934815 ZT8-11 10.074597 10.074597 10.074597 ZT12-15 14.7496465 14.7496465 14.7496465 ZT16-19 11.184755 11.184755 11.184755 ZT20-23 10.068555 10.068555 10.068555