condition mean min max ZT0-3 1.37921775 0.9649605000000001 1.793475 ZT4-7 5.825545 5.825545 5.825545 ZT8-11 3.5657050000000003 3.5657050000000003 3.5657050000000003 ZT12-15 0 0 0 ZT16-19 3.35947 3.35947 3.35947 ZT20-23 3.413455 3.413455 3.413455