condition mean min max ZT0-3 12.053071 12.053071 12.053071 ZT4-7 12.759754000000001 12.759754000000001 12.759754000000001 ZT8-11 13.0327845 13.0327845 13.0327845 ZT12-15 13.3662225 13.3662225 13.3662225 ZT16-19 11.907704500000001 11.907704500000001 11.907704500000001 ZT20-23 12.2355585 12.2355585 12.2355585