condition mean min max ZT0-3 7.0958025 7.06306 7.128545 ZT4-7 10.580155 10.580155 10.580155 ZT8-11 8.96805 8.96805 8.96805 ZT12-15 0 0 0 ZT16-19 8.956275000000002 8.956275000000002 8.956275000000002 ZT20-23 10.0456 10.0456 10.0456