condition mean min max ZT0-3 0.24590333333333336 0.2130405 0.30264100000000005 ZT4-7 0.1174245 0.1174245 0.1174245 ZT8-11 0.2103775 0.2103775 0.2103775 ZT12-15 0.71572475 0.670751 0.7606985 ZT16-19 0.42553450000000004 0.42553450000000004 0.42553450000000004 ZT20-23 0.9074789999999999 0.9074789999999999 0.9074789999999999