Table 2.

Percentage fatty acid compositions (mol%) in erythrocyte membranes in case and control subjects

Fatty acidCommon nameCase subjects (n = 74)
Control subjects (n = 221)
P, χ2 or t test
MeanSDMeanSD
SFAs*53.01.852.12.2<0.01
    14:0Myristic acid0.80.30.70.2NS
    16:0Palmitic acid30.91.430.21.8<0.001
    18:0Stearic acid21.31.121.11.1NS
MUFAs18.51.318.41.7NS
    16:1n-7Palmitoleic acid1.20.31.10.4<0.05
    18:1n-9Oleic acid17.31.317.31.5NS
PUFAs28.52.129.53.1<0.01
    n-6 PUFAs§20.01.720.72.0<0.05
        18:2n-6Linoleic acid10.01.110.31.3NS
        18:3n-6γ-Linolenic acid0.080.030.090.12<0.05
        20:3n-6Dihomo-γ-linolenic acid0.780.180.750.18NS
        20:4n-6Arachidonic acid (AA)9.21.39.51.5NS
    n-3 PUFAs8.51.68.82.0NS
        18:3n-3α-Linolenic acid0.40.20.40.3NS
    n-3 HUFAs8.11.68.42.0NS
        20:5n-3Eicosapentaenoic acid (EPA)1.40.51.50.6NS
        22:5n-3Docosapentaenoic acid1.40.41.40.3NS
        22:6n-3Docosahexaenoic acid (DHA)5.31.05.51.3NS
Saturation index n-7(16:0/16:1n-7)27.037.8831.2213.02<0.01
Saturation index n-9(18:0/18:1n-9)1.240.141.230.14NS
SFAs/PUFAs1.870.211.800.28<0.05
    SFAs/n-6 PUFAs2.670.292.550.34<0.01
    SFAs/n-3 PUFAs6.531.746.321.97NS
    SFAs/n-3 HUFAs6.932.066.672.14NS
n-6 PUFAs/n-3PUFAs2.460.622.470.61NS
    n-6 PUFAs/n-3HUFAs2.610.732.610.67NS
    AA/EPA**7.775.567.353.31NS
    AA/DHA††1.790.451.780.39NS
  • Abbreviation: NS, not significant.

  • * SFAs = 14:0 + 16:0 + 18:0.

  • MUFAs = 16:1n-7 + 18:1n-9.

  • PUFAs = n-6 PUFAs + n-3 PUFAs.

  • § n-6 PUFAs = 18:2n-6 + 18:3n-6 + 20:3n-6 + 20:4n-6 (AA).

  • n-3 PUFAs = 18:3n-3 + n-3 HUFAs.

  • n-3 HUFAs = 20:5n-3 (EPA) + 22:5n-3 + 22:6n-3 (DHA).

  • ** 20:4n-6/20:5n-3.

  • †† 20:4n-6/22:6n-3.