condition mean min max ZT0-3 9.707831 9.707831 9.707831 ZT4-7 10.7417985 10.7417985 10.7417985 ZT8-11 10.568211 10.568211 10.568211 ZT12-15 10.200071000000001 10.200071000000001 10.200071000000001 ZT16-19 9.965505499999999 9.965505499999999 9.965505499999999 ZT20-23 11.188785 11.188785 11.188785