condition mean min max ZT0-3 25.906019 25.906019 25.906019 ZT4-7 20.8408885 20.8408885 20.8408885 ZT8-11 17.55445 17.55445 17.55445 ZT12-15 20.4535545 20.4535545 20.4535545 ZT16-19 26.1729515 26.1729515 26.1729515 ZT20-23 19.7356565 19.7356565 19.7356565