condition mean min max ZT0-3 754.635696 754.635696 754.635696 ZT4-7 714.2942835 714.2942835 714.2942835 ZT8-11 600.777245 600.777245 600.777245 ZT12-15 819.3148005 819.3148005 819.3148005 ZT16-19 582.2806985 582.2806985 582.2806985 ZT20-23 585.0528575000001 585.0528575000001 585.0528575000001