condition mean min max ZT0-3 0.6298705 0.1525725 1.5187 ZT4-7 0.8145074999999999 0.8145074999999999 0.8145074999999999 ZT8-11 0.3010045 0.3010045 0.3010045 ZT12-15 0.46957 0.2224155 0.7167245 ZT16-19 0.1635475 0.1635475 0.1635475 ZT20-23 0.09224635 0.09224635 0.09224635