condition mean min max ZT0-3 6.537686615249999 6.095215339499999 6.980157891 ZT4-7 5.6180366445 4.956519632 6.279553656999999 ZT8-11 7.824937586 6.273190948 9.376684224 ZT12-15 13.661386602499999 11.945102175 15.377671029999998 ZT16-19 12.568317639999998 11.962952394999999 13.173682884999998 ZT20-23 12.097066569999999 11.814134209999999 12.37999893