condition mean min max ZT0-3 14.912502 14.912502 14.912502 ZT4-7 10.7362645 10.7362645 10.7362645 ZT8-11 10.8898925 10.8898925 10.8898925 ZT12-15 10.3923175 10.3923175 10.3923175 ZT16-19 12.8822385 12.8822385 12.8822385 ZT20-23 12.9587275 12.9587275 12.9587275