condition mean min max ZT0-3 4.508895000000001 4.508895000000001 4.508895000000001 ZT4-7 1.43422 1.43422 1.43422 ZT8-11 3.112525 3.112525 3.112525 ZT12-15 4.257515 4.257515 4.257515 ZT16-19 2.49878 2.49878 2.49878 ZT20-23 2.46455 2.46455 2.46455