condition mean min max ZT0-3 0.9577090000000001 0.75158 1.1638380000000002 ZT4-7 0.621883 0.621883 0.621883 ZT8-11 1.1532305 1.1532305 1.1532305 ZT12-15 0 0 0 ZT16-19 1.44038 1.44038 1.44038 ZT20-23 1.0194455 1.0194455 1.0194455