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Table 2 Body weight data from studies in meta-analysis and imputations of standard deviations for changes from baseline

From: Effects of workplace-based dietary and/or physical activity interventions for weight management targeting healthcare professionals: a systematic review of randomised controlled trials

Study Follow-up time point (s) Baseline weight (Kg) Intervention Baseline weight (Kg) Control Follow-up weight (Kg) Intervention Follow-up weight (Kg) Control Change weight (Kg) Intervention Change weight (Kg) Control Difference change body weight (Kg) intervention Vs control* Quality Score
Behavioural target
n n n n
  Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SDa) Mean (SDa) Mean (95% CI)  
Barratt 1994 [52] 6 months 71.0(NR) 70.4(NR) 70.6(NR) 70.5(NR) −0.40(2.40a b) +0.60(3.20ab) −1.0 (−1.84, −0.16) Weak
Dietary     56 130 56 130
Gamble 1993 [42] 11 weeks 76.30(13.01) 78.90(5.14) 76.50(12.44) 79.10(5.38) +0.20(4.80c) +0.20(2.0c) 0 (−3.69, 3.69) Moderate
Physical activity     8 6 8 6
Hewitt 2008 [45] 8 weeks 68.5 (12.1) 66.4 (13.2) 69.4 (12.7b) 66.5 (13.0b) +0.9 (4.68c) +0.1 (4.90c) 0.8 (−3.51, 5.11) Strong
Physical activity     12 8 12 8
Gerdle 1995 [46] 12 months 67.0(11.6) 65.0(12.0) 66.0(10.9) 65.0(10.4) −1.0(4.30c) 0.0(4.50c) −1.0 (−2.99, 0.99) Weak
Physical activity     32 45 32 45
Aldana 2005 [34] 6 months 89.3(NR) 85.9(NR) 84.9(NR) 84.9(NR) −4.4(5.05d) −1.0(5.05d) −3.4 (−5.06, −1.74) Moderate
Dietary and Physical activity     64 79 64 79
Racette 2009 [48]          
Dietary and Physical activity 12 months 92.4(24.9) 84.5(20.9) 91.6(25.5) 85.1(23.2) −0.80(5.0a) +0.60(5.0a) −1.4 (−3.18, 0.38) Weak
42 34 42 34
Christensen 2011 [36] 3 months 84.30(16.0) 83.0(14.4) 80.71(16.0) 83.68(14.4) −3.59(3.80) +0.68(2.37) −4.27 (−5.53, −3.01) Strong
Dietary and Physical activity     52 42 52 42
  12 months 84.20(16.0) 83.0(14.4) 78.4(15.8) 82.7(14.6) −5.80(5.90) −0.30(5.40) −5.50 (−7.79, −3.21)  
52 42 52 42
  1. aSDs calculated directly from the reported confidence intervals; bAdditional unpublished data provided; cWhere change SDs were not explicitly reported, they were calculated from the reported baseline and final SDs using the correlation method advocated in the Cochrane handbook [32],[33] – correlation coefficient calculated directly from the empirical data presented in Christensen [55]; dSDs calculated directly from the reported p-value; NR = Not reported; *A minus figure indicates mean difference in body weight change in favour of intervention.