condition mean min max ZT0-3 10.953695 10.953695 10.953695 ZT4-7 9.718681 9.718681 9.718681 ZT8-11 9.936208 9.936208 9.936208 ZT12-15 10.061202 10.061202 10.061202 ZT16-19 9.5714515 9.5714515 9.5714515 ZT20-23 9.2345365 9.2345365 9.2345365