condition mean min max ZT0-3 50.462922 50.462922 50.462922 ZT4-7 42.966994 42.966994 42.966994 ZT8-11 43.5944705 43.5944705 43.5944705 ZT12-15 53.831652000000005 53.831652000000005 53.831652000000005 ZT16-19 45.8559125 45.8559125 45.8559125 ZT20-23 39.626503 39.626503 39.626503