condition mean min max ZT0-3 6.952612784 4.939714405 8.965511163 ZT4-7 5.7958243895 5.4827961755 6.108852603500001 ZT8-11 6.949800408749999 6.0967822289999996 7.802818588499999 ZT12-15 5.56239646425 5.5173616585000005 5.607431269999999 ZT16-19 8.26568282375 7.8343007165000005 8.697064931 ZT20-23 11.031396172 10.095829024 11.966963320000001