Table 3 Weight change between 12 and 24 months using measured weights only (A) or using both measured and self-reported weights (B)

From: The challenge of a 2-year follow-up after intervention for weight loss in primary care

Analysis

N

Mean weight change (s.d.) in kg

Adjusted difference (CI) in kg

P-value

  

CP

SC

  

A) Measured weights only

 LOCF

772

0.92 (2.42)

0.26 (2.20)

0.69 (0.36, 1.01)

<0.001

 BOCF

772

2.73 (4.82)

1.02 (3.50)

1.68 (1.09, 2.28)

<0.001

 Completersa

203

2.83 (3.58)

0.88 (4.14)

1.97 (0.89, 3.05)

<0.001

 MAR (GLS)

772

2.94

0.93

2.01 (0.98, 3.03)

<0.001

B) Measured and self-reported weights

 LOCF

772

1.62 (4.03)

0.10 (3.04)

1.51 (1.01, 2.02)

<0.001

 BOCF

772

2.21 (4.57)

0.53 (3.87)

1.68 (1.08, 2.27)

<0.001

 Completersb

306

3.27 (5.01)

0.46 (4.30)

2.71 (1.63, 3.79)

<0.001

 MAR (GLS)

772

3.00

0.29

2.72 (1.70, 3.73)

<0.001

  1. Abbreviations: BOCF, baseline observation carried forward; CI, 95% confidence interval; CP, commercial programme; kg, kilogram; LOCF, last observation carried forward; MAR, missing at random; GLS, generalised least squares; SC, standard care; s.d., standard deviation.
  2. P-value is given for the treatment difference.
  3. acompleters are defined as those participants who provided measured weight data at baseline, after 12 and 24 months.
  4. bcompleters are defined as those participants who provided a measured weight at baseline and at 12 months and either a measured or self-reported weight at 24 months. Those who did not attend the 12-month visit but provided self-reported 24-month weight data (n=35) are not included.
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