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Table 3 Anthropometric parameters in Zinc and Control groups

From: Zinc supplementation improves body weight management, inflammatory biomarkers and insulin resistance in individuals with obesity: a randomized, placebo-controlled, double-blind trial

VariableTimeZinc groupPlacebo groupP*
Body weight (kg)Baseline89.59 ± 17.1088.41 ± 12.460.781
Week 783.16 ± 14.5287.09 ± 12.530.312
Week 1584.99 ± 13.4186.93 ± 12.340.597
P**0.0200.007 
Mean changea− 4.60 ± 8.80− 1.48 ± 2.370.093
P***  0.032
BMI (kg/m2)Baseline33.17  ± 6.3432.64 ± 2.370.701
Week 730.66 ± 4.1032.16 ± 2.630.129
Week 1531.50 ± 5.0832.09 ± 2.310.599
P**0.0240.007 
Mean change− 1.66 ± 3.33− 0.55 ± .890.113
P***  0.025
Waist circumference (cm)Baseline99.48 ± 10.1999.32 ± 9.420.954
Week 796.80  ± 10.0798.10 ± 9.440.639
Week 1594.36 ± 10.3197.82 ± 9.900.231
P***0.1050.023 
Mean change− 5.12 ± 6.67− 1.49 ± 3.520.020
P***  0.003
Hip circumference (cm)Baseline114.72 ± 8.77115.16 ± 5.490.833
Week 7111.83 ± 8.17114.68 ± 5.640.159
Week 15109.84 ± 7.53114.68 ± 5.680.013
P**0.00010.063 
Mean change− 4.88 ± 3.58− 0.48 ± 1.040.0001
P***  0.0001
WHRBaseline0.87 ± 0.090.86 ± 0.060.734
Week 70.86 ± 0.070.85 ± 0.060.597
Week 150.86 ± 0.110.85 ± 0.070.710
P**0.8640.1490.880
Mean change− 0.07 ± 0.053− 0.009 ± 0.028
P***  0.682
  1. All values are mean ± SD
  2. aMean change for the 15-week period
  3. P*: p-values for comparison of variables between two group by independent T-test
  4. P**: p-values for comparison of variables within groups by analysis of variance for repeated measurement
  5. P***: p-values for comparison between mean changes of variables by Analysis of covariance (adjusted for age, mean change of calorie intake, mean change of zinc intake)