condition mean min max ZT0-3 13.3668 13.3668 13.3668 ZT4-7 11.82745 11.82745 11.82745 ZT8-11 11.15805 11.15805 11.15805 ZT12-15 14.00665 14.00665 14.00665 ZT16-19 14.88635 14.88635 14.88635 ZT20-23 14.4424 14.4424 14.4424