condition mean min max ZT0-3 0.43056649999999996 0.43056649999999996 0.43056649999999996 ZT4-7 0.253795 0.253795 0.253795 ZT8-11 0.0553355 0.0553355 0.0553355 ZT12-15 0.3521865 0.3521865 0.3521865 ZT16-19 0.488986 0.488986 0.488986 ZT20-23 0.30865600000000004 0.30865600000000004 0.30865600000000004