condition mean min max ZT0-3 20.9607170075 15.391909755 26.52952426 ZT4-7 11.460746851 9.278083167 13.643410535000001 ZT8-11 21.1860827875 15.98096713 26.391198445 ZT12-15 18.1947575625 16.148034495 20.24148063 ZT16-19 13.29331298 13.172169109999999 13.41445685 ZT20-23 12.2810371025 12.059117964999999 12.50295624