condition mean min max ZT0-3 11.53473 10.30126 12.7682 ZT4-7 8.218235 8.218235 8.218235 ZT8-11 11.515799999999999 11.515799999999999 11.515799999999999 ZT12-15 0 0 0 ZT16-19 10.086625000000002 10.086625000000002 10.086625000000002 ZT20-23 8.569424999999999 8.569424999999999 8.569424999999999