Fatty acids in retail whole milk (g/100 g), 12 months ending December 2011.

* Calculated by t test except as noted. Because of multiple comparisons, about 2 findings of P = 0.05 and 0.5 finding of P = 0.01 can be expected by chance.
† These group means (means of sums of saturated, monounsaturated, or polyunsaturated FA) are biased slightly low, because they include some sums containing unreported small values (< 0.001) treated as zero. In contrast, when n is less than the number of samples (organic n<143, conventional n<108), means of individual FA are biased slightly high by omission of unreported small values. Thus these group means are slightly less than the sum of means of the individual FA.
‡ Calculated by Mann-Whitney test due to non-normal distributions with medians 0.080 (organic) and 0.091 (conventional). (P = 0.020 calculated by t test).
§ The trans FA group mean exceeds the sum of individual trans FA, because it includes small amounts of trans-14:1 omitted from the table due to small numbers of reported values (42 organic, 27 conventional).