condition mean min max ZT0-3 8.018422549499999 6.8021404709999995 9.234704628 ZT4-7 9.470147772499999 9.1138725235 9.8264230215 ZT8-11 11.48439264325 9.728534708000002 13.240250578500001 ZT12-15 12.2403712065 10.712625708000001 13.768116705 ZT16-19 11.454455975000002 10.836887955000002 12.072023995 ZT20-23 7.2524207160000005 5.772755838 8.732085594