condition mean min max ZT0-3 0.63485425 0.286306 0.9834025 ZT4-7 1.9865925 1.9865925 1.9865925 ZT8-11 1.28464 1.28464 1.28464 ZT12-15 0 0 0 ZT16-19 0.422696 0.422696 0.422696 ZT20-23 0.708427 0.708427 0.708427