condition mean min max ZT0-3 75.58525 71.9387 79.2318 ZT4-7 91.1724 91.1724 91.1724 ZT8-11 127.71600000000001 127.71600000000001 127.71600000000001 ZT12-15 0 0 0 ZT16-19 117.3735 117.3735 117.3735 ZT20-23 109.3255 109.3255 109.3255