condition mean min max ZT0-3 28.973553312499998 22.887352625 35.059754 ZT4-7 13.1453915775 11.66480648 14.625976675 ZT8-11 13.9735886325 13.805474145 14.141703119999999 ZT12-15 10.36356239925 10.1020250685 10.62509973 ZT16-19 14.182716185 10.99340403 17.37202834 ZT20-23 31.702821815 27.455533045 35.950110585000004