condition mean min max ZT0-3 3.2611296185 2.00509185 4.517167387 ZT4-7 7.365185891666667 5.8546949690000005 8.875676814333334 ZT8-11 11.974139995333331 11.190941822666666 12.757338167999999 ZT12-15 9.826938086 9.214181480333334 10.439694691666666 ZT16-19 10.921991139166666 10.855752449999999 10.988229828333333 ZT20-23 8.456030029166666 7.545826262333334 9.366233796