condition mean min max ZT0-3 0.5480966666666667 0.41833149999999997 0.632387 ZT4-7 0.1252953 0.1252953 0.1252953 ZT8-11 0.602247 0.602247 0.602247 ZT12-15 1.7673200000000002 1.422525 2.112115 ZT16-19 0.59107 0.59107 0.59107 ZT20-23 0.7053095 0.7053095 0.7053095