condition mean min max ZT0-3 0.9890375 0.9890375 0.9890375 ZT4-7 0.6677465 0.6677465 0.6677465 ZT8-11 0.34318099999999996 0.34318099999999996 0.34318099999999996 ZT12-15 0.31368300000000005 0.31368300000000005 0.31368300000000005 ZT16-19 0.638906 0.638906 0.638906 ZT20-23 1.329865 1.329865 1.329865