condition mean min max ZT0-3 5.3984950000000005 5.027755 5.769235 ZT4-7 4.663525 4.663525 4.663525 ZT8-11 4.44344 4.44344 4.44344 ZT12-15 0 0 0 ZT16-19 14.40005 14.40005 14.40005 ZT20-23 13.1569 13.1569 13.1569