condition mean min max ZT0-3 0.2142355 0.2142355 0.2142355 ZT4-7 0.1603745 0.1603745 0.1603745 ZT8-11 0.3629005 0.3629005 0.3629005 ZT12-15 0.12338149999999999 0.12338149999999999 0.12338149999999999 ZT16-19 0.3258215 0.3258215 0.3258215 ZT20-23 0.4633625 0.4633625 0.4633625