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Table 5 Results from the mixed-effects linear regression models for primary and secondary outcomes

From: Using a brief web-based 5A intervention to improve weight management in primary care: results of a cluster-randomized controlled trial

Mixed modela

Outcome

n

Diff

(95% CI)

p

d

(95% CI)

Primary Outcomes

 PACIC 5A sum score

  Baseline

113

0.03

(-2.37–2.44)

.976

  

  FU1 – 6 months after BL

100

2.53

(-4.97–10.03)

.509

0.12

(-0.27–0.52)

  FU2 – 12 months after BL

101

2.81

(-2.45–8.08)

.295

0.20

(-0.18–0.60)

Secondary Outcomes

 BMI

  Baseline

125

-0.15

(-0.52–0.23)

.450

  

  FU1 – 6 months after BL

115

-0.62

(-1.43–0.19)

.134

-0.29

(-0.65–0.77)

  FU2 – 12 months after BL

109

-0.22

(-1.10–0.65)

.617

-0.95

(-0.47–0.28)

 EQ-5D-5L total score

  Baseline

126

0.21

(-0.92–1.33)

.717

  

  FU1 – 6 months after BL

115

-0.34

(-3.90–3.22)

.851

-0.03

(-0.40–0.33)

  FU2 – 12 months after BL

109

1.28

(-2.25–4.82)

.476

0.13

(-0.24–0.51)

 Readiness Ruler

  Baseline

127

0.07

(-0.16–0.29)

.559

  

  FU1 – 6 months after BL

118

-0.61

(-1.19—-0.03)

 < .05

-0.39

(-0.75—-0.02)

  FU2 – 12 months after BL

110

-0.26

(-1.07–0.55)

.529

-0.11

(-0.49–0.26)

 WBIS

  Baseline

128

0.02

(-0.10–0.15)

.699

  

  FU1 – 6 months after BL

113

-0.49

(-0.82—-0.15)

 < .01

-0.53

(-0.90—-0.15)

  FU2 – 12 months after BL

108

-0.16

(-0.47–0.15)

.308

-0.19

(-0.57–0.18)

 PHQ-9 total score

  Baseline

125

-0.12

(-0.56–0.32)

.586

  

  FU1 – 6 months after BL

113

-0.22

(-1.15–0.71)

.646

-0.08

(-0.45–0.28)

  FU2 – 12 months after BL

106

-0.69

(-2.05–0.65)

.310

-0.19

(-0.58–0.18)

  1. Diff Adjusted mean outcome differences, i.e., intervention group minus control group, CI Confidence interval, FU1 Follow-up 1, FU2 Follow-up 2, d Effect size: standardized mean difference (Cohen’s d) at follow-up
  2. aMixed-effects linear regression of outcome on treatment group (intervention group vs. control group), time (baseline, FU1, FU2) and interaction between treatment group and time adjusted for baseline score, age, gender, education, marital status and neuroticism