condition mean min max ZT0-3 4.77178 4.77178 4.77178 ZT4-7 5.586075 5.586075 5.586075 ZT8-11 5.829395 5.829395 5.829395 ZT12-15 4.403545 4.403545 4.403545 ZT16-19 3.271465 3.271465 3.271465 ZT20-23 4.364385 4.364385 4.364385