condition mean min max ZT0-3 0.2601455 0.21024749999999998 0.3387405 ZT4-7 0.09264955 0.09264955 0.09264955 ZT8-11 0.2886395 0.2886395 0.2886395 ZT12-15 0.45855324999999997 0.405026 0.5120804999999999 ZT16-19 0.4854585 0.4854585 0.4854585 ZT20-23 0.5501835 0.5501835 0.5501835