condition mean min max ZT0-3 1.275045 1.0883500000000002 1.4617399999999998 ZT4-7 0.3647985 0.3647985 0.3647985 ZT8-11 0.461701 0.461701 0.461701 ZT12-15 0 0 0 ZT16-19 0.917216 0.917216 0.917216 ZT20-23 1.017995 1.017995 1.017995