condition mean min max ZT0-3 14.048821 14.048821 14.048821 ZT4-7 13.719425000000001 13.719425000000001 13.719425000000001 ZT8-11 14.3916275 14.3916275 14.3916275 ZT12-15 11.614620500000001 11.614620500000001 11.614620500000001 ZT16-19 12.077033499999999 12.077033499999999 12.077033499999999 ZT20-23 16.2960885 16.2960885 16.2960885