condition mean min max ZT0-3 262.911111 262.911111 262.911111 ZT4-7 250.52356 250.52356 250.52356 ZT8-11 222.980333 222.980333 222.980333 ZT12-15 237.6714775 237.6714775 237.6714775 ZT16-19 326.96510350000005 326.96510350000005 326.96510350000005 ZT20-23 446.01259300000004 446.01259300000004 446.01259300000004