condition mean min max ZT0-3 11.518818 11.518818 11.518818 ZT4-7 10.528704000000001 10.528704000000001 10.528704000000001 ZT8-11 13.11762 13.11762 13.11762 ZT12-15 13.636767500000001 13.636767500000001 13.636767500000001 ZT16-19 13.1497165 13.1497165 13.1497165 ZT20-23 12.0508815 12.0508815 12.0508815