condition mean min max ZT0-3 0.290288 0.290288 0.290288 ZT4-7 0.2345955 0.2345955 0.2345955 ZT8-11 0.24338100000000001 0.24338100000000001 0.24338100000000001 ZT12-15 0.570486 0.570486 0.570486 ZT16-19 0.540278 0.540278 0.540278 ZT20-23 0.573644 0.573644 0.573644