condition mean min max ZT0-3 0.7239595 0.4869705 0.9609485 ZT4-7 0.87025 0.87025 0.87025 ZT8-11 0.456689 0.456689 0.456689 ZT12-15 0 0 0 ZT16-19 0.08987135 0.08987135 0.08987135 ZT20-23 0.180782 0.180782 0.180782