condition mean min max ZT0-3 13.006575 12.86645 13.1467 ZT4-7 15.5551 15.5551 15.5551 ZT8-11 17.3701 17.3701 17.3701 ZT12-15 0 0 0 ZT16-19 16.9566 16.9566 16.9566 ZT20-23 13.392700000000001 13.392700000000001 13.392700000000001