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Table 3 Website engagement and percentage weight loss: multiple regression analysis

From: The association between weight loss and engagement with a web-based food and exercise diary in a commercial weight loss programme: a retrospective analysis

Independent associations with percentage weight loss1
  Beta p Variance explained by engagement
R2 change (p)
Variance explained by model
Adjusted R2
Women     
Food diary engagement .40 < .001 13% (< .001) 19%
Exercise diary engagement .33 < .001 9% (< .001) 15%
Forum use (dichotomised) .14 < .001 2% (< .001) 8%
Men     
Food diary engagement .49 < .001 18% (< .001) 21%
Exercise diary engagement .45 < .001 17% (< .001) 20%
Forum use (dichotomised) .04 .30 ns 0.2% (.29 ns) 3%
Mutually adjusted associations with percentage weight loss 2
  Beta p Variance explained by engagement
R2 change (p)
Variance explained by model
Adjusted R2
Women     
Food diary engagement .36 < .001 13% (< .001) 19%
Exercise diary engagement .03 .48 ns   
Forum use (dichotomised) .07 < .01   
Men     
Food diary engagement .30 < .001 19% (< .001) 22%
Exercise diary engagement .21 < .01   
Forum use (dichotomised) -.01 .75 ns   
  1. Women N = 2979 Men N = 642
  2. 1Covariates: initial BMI, and number of days between first and last recorded weight. Separate analyses for each engagement variable
  3. 2Covariates as above and all engagement variables included in the model