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Table 3 ANOVA results: portion size effect on primary intake variables

From: Reductions to main meal portion sizes reduce daily energy intake regardless of perceived normality of portion size: a 5 day cross-over laboratory experiment

Dependent variableMain effect portion sizeInteraction a
Daily energy intakeF(2, 58) = 20.09, p < 0.001, ηρ2 = 0.41F(5.50, 159.60) = 0.70, p = 0.64, ηρ2 = 0.02
Immediate additional intakeF(1.68, 48.60) = 52.72, p < 0.001, ηρ2 = 0.65F(2, 58) = 30.16, p < 0.001, ηρ2 = 0.51 b
 LunchF(1.57, 45.47) = 65.29, p < 0.001, ηρ2 = 0.69F(5.22, 151.28) = 1.84, p = 0.11, ηρ2 = 0.06
 DinnerF(2, 58) = 6.09, p = 0.004, ηρ2 = 0.17F(4.66, 135.07) = 0.61, p = 0.68, ηρ2 = 0.02
Total meal intakeF(1.54, 44.64) = 50.89, p < 0.001, ηρ2 = 0.64F(1.56, 45.30) = 13.12, p < 0.001, ηρ2 = 0.31 b
 LunchF(2, 58) = 17.83, p < 0.001, ηρ2 = 0.38F(5.48, 159.04) = 0.88, p = 0.50, ηρ2 = 0.03
 DinnerF(1.52, 44.13) = 51.96, p < 0.001, ηρ2 = 0.64F(4.89, 141.80) = 0.56, p = 0.73, ηρ2 = 0.02
  1. a All interactions portion x day, except b interaction portion x meal (lunch, dinner). Immediate additional intake refers to additional helpings of the portion size manipulated food consumed at lunch and dessert consumed at dinner