condition mean min max ZT0-3 3.243095 3.243095 3.243095 ZT4-7 12.6601 12.6601 12.6601 ZT8-11 2.38204 2.38204 2.38204 ZT12-15 0.6182890000000001 0.6182890000000001 0.6182890000000001 ZT16-19 0.628158 0.628158 0.628158 ZT20-23 0.8741325 0.8741325 0.8741325