condition mean min max ZT0-3 15.5308 15.5308 15.5308 ZT4-7 13.50155 13.50155 13.50155 ZT8-11 11.0146 11.0146 11.0146 ZT12-15 11.77205 11.77205 11.77205 ZT16-19 15.351300000000002 15.351300000000002 15.351300000000002 ZT20-23 13.6601 13.6601 13.6601