condition mean min max ZT0-3 9.11941 9.11941 9.11941 ZT4-7 9.79993 9.79993 9.79993 ZT8-11 9.460987 9.460987 9.460987 ZT12-15 9.643003499999999 9.643003499999999 9.643003499999999 ZT16-19 9.287754 9.287754 9.287754 ZT20-23 8.734723500000001 8.734723500000001 8.734723500000001