highly significantp < 10 −8
The univariate ANCOVA model applied (equation 2 ) revealed very highly significant differences between (1) the culinary oils investigated ( p < 10 −8 , with the exception of cis -2-alkenals for which p = 4.85 × 10 −3 ), and (2) sampling time-points ( p < 10 −8 ) for all aldehydes monitored.