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Table 2 Weight change from baseline at 3 and 6 months

From: Portion control for the treatment of obesity in the primary care setting

  Usual Care
(N = 32)
Portion Control
(N = 33)
Difference in Means
(Plate-Control)
 
   mean ± SD   mean ± SD    
  N (min, max) N (min, max) Estimate (95% C.I.) P-value*
3 months        
   Change from baseline (kgs)        
Complete case 24 -0.6 ± 2.2
(-6.4, +2.3)
23 -2.2 ± 3.6
(-11.6, +4.2)
-1.6 (-3.3, +0.1) 0.071
Last value carried forward 32 -0.4 ± 1.9
(-6.4, +2.3)
33 -1.5 ± 3.1
(-11.6, +4.2)
-1.1 (-2.4, +0.2) 0.099
   % change from baseline        
Complete case 24 -0.5 ± 2.2
(-5.2, +2.3)
23 -2.4 ± 3.7
(-11.4, +3.9)
-1.8 (-3.6, +0.7) 0.041
Last observation carried forward 32 -0.4 ± 1.9
(-5.2, +2.3)
33 -1.7 ± 3.3
(-11.4, +3.9)
-1.3 (-2.6, +0.1) 0.062
6 months        
   Change from baseline (kgs)        
Complete case 23 -0.9 ± 4.2
(-15.7, +3.9)
19 -1.9 ± 3.7
(-10.0, +6.1)
-1.0 (-3.5, +1.5) 0.414
Last value carried forward 32 -0.5 ± 3.6
(-15.7, +3.9)
33 -1.0 ± 3.0
(-10.0, +6.1)
-0.5 (-2.2, +1.1) 0.528
   % change from baseline        
Complete case 23 -0.7 ± 3.7
(-12.3, +3.7)
19 -2.1 ± 3.8
(-9.8, +5.6)
-1.4 (-3.7, +0.9) 0.232
Last observation carried forward 32 -0.4 ± 3.2
(-12.3, +3.7)
33 -1.2 ± 3.1
(-9.8, +5.6)
-0.8 (-2.3, +0.8) 0.311
  1. * Two-sample t-test