Table 3: Trans fatty acids concentrations (µmol/L) by year

Fatty acid	2004 n = 95 (M = 25, F = 70)	2005 n = 234 (M = 80, F = 154)	2006 n = 227 (M = 69, F = 158)	2007 n = 137 (M = 34, F = 103)	2008 n = 203 (M = 52, F = 151)	2009 n = 201 (M = 136, F = 65)	2010 n = 197 (M = 71, F = 126)
16:1t9	28.57 ± 10.10*	21.61 ± 8.23†	14.67 ± 12.64§	15.16 ± 11.43§	16.82 ± 7.05‡,§	19.43 ± 8.42†,‡	20.56 ± 10.05†
18:1t4	4.28 ± 4.27†	1.89 ± 2.23‡	5.06 ± 5.44*,†	6.77 ± 8.62*	6.56 ± 5.69*	6.06 ± 6.59*,†	5.79 ± 4.41*,†
18:1t5	2.34 ± 2.69†	1.10 ± 1.93‡	0.57 ± 1.24‡	0.56 ± 1.13‡	0.44 ± 0.83‡	1.87 ± 3.99†	6.43 ± 4.22*
18:1t6-8	16.85 ± 8.91*	9.71 ± 5.33‡	5.53 ± 3.10§	5.75 ± 3.01§	5.30 ± 4.39§	5.91 ± 5.56§	11.39 ± 8.18†
18:1t9	32.81 ± 15.96*	16.25 ± 8.32†	14.28 ± 6.83†,‡	14.39 ± 6.43†,‡	11.56 ± 7.54‡	13.13 ± 9.43†,‡	32.54 ± 22.07*
18:1t10	34.46 ± 14.95*	20.19 ± 9.53†	13.22 ± 7.26‡,§	13.09 ± 6.36‡,§	9.84 ± 6.50§	16.35 ± 9.84‡	31.80 ± 27.02*
18:1t11	24.34 ± 11.33*	19.01 ± 10.14†	16.25 ± 7.91‡	15.53 ± 5.79‡	11.95 ± 7.34§	12.53 ± 9.10§	9.41 ± 6.14¶
18:1t12	18.40 ± 8.12*	11.90 ± 5.92†	8.95 ± 4.66‡	10.00 ± 5.15†,‡	6.71 ± 4.33§	10.12 ± 8.06†,‡	11.04 ± 8.67†
18:1t13 or c6	13.63 ± 6.03†,‡	3.73 ± 7.10‡	10.89 ± 6.32‡	13.62 ± 6.72†,‡	15.00 ± 86.76†,‡	30.98 ± 58.95*	27.45 ± 34.33*,†
18:2c9t12	20.57 ± 6.33*,†	11.10 ± 4.14§	20.00 ± 24.53*,†	17.10 ± 7.62†,‡	14.17 ± 4.79‡,§	17.13 ± 7.65†,‡	22.01 ± 10.94*
18:2c9t13	16.33 ± 5.79*	11.19 ± 5.47†	12.90 ± 6.62†	11.29 ± 5.89†	2.91 ± 10.08§	4.93 ± 9.42§	7.83 ± 4.96‡
18:2t9c12	12.82 ± 3.81†	7.11 ± 3.49 e	10.48 ± 3.93‡	10.87 ± 4.73‡	8.90 ± 3.07§	11.64 ± 6.25†,‡	15.06 ± 7.44*
18:2t9t12	1.67 ± 0.79†,‡	0.34 ± 0.66§	2.22 ± 3.06†	2.00 ± 2.87†,‡	1.26 ± 1.34‡	2.57 ± 3.76†	7.33 ± 5.11*
18:2tt	1.93 ± 1.27‡,§	1.69 ± 1.25§	2.39 ± 3.50‡,§	4.30 ± 10.12†	4.18 ± 2.39†	3.43 ± 3.56†	10.26 ± 8.01*
18:2c9t11 CLA	23.62 ± 8.94*	17.26 ± 7.22†	16.32 ± 6.34†	16.28 ± 6.91†	12.62 ± 5.79‡	12.95 ± 7.41‡	17.49 ± 9.89†
18:2c10t12 CLA	6.25 ± 1.86*	4.28 ± 1.62‡	3.85 ± 1.31†	5.09 ± 2.37§	3.02 ± 1.41‡	3.93 ± 3.13‡	6.29 ± 4.30*
Total trans	228.99 ± 81.6*	136.83 ± 56.1†,‡	137.41 ± 58.4†,‡	140.42 ± 54.5†,‡	115.60 ± 96.9‡	156.08 ± 97.8†	218.89 ± 112.6*

Note: F = female, M = male. Values are expressed as mean ± standard deviation. Differences in years were analyzed by analysis of variance (ANOVA), and the Tukey posthoc test was used to determine differences between means. Total trans excludes conjugated linoleic acid isomers. Values within a row with different symbols are significantly different (p < 0.05).