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Table 5 Comparison of knowledge about dietary supplements between pre- and post-intervention

From: An educational intervention improved knowledge of dietary supplements in college students

  Strongly agree (%)Agree (%)Neither agree nor disagree (%)Disagree (%)Strongly disagree (%)Z scorep-value
Dietary supplements are safe because they are just food items.Pre2.737.525.330.24.3−8.497< 0.01
Post1.215.623.647.911.7
Dietary supplements made from natural ingredients or herbs are safe.Pre2.844.028.421.13.7−10.280< 0.01
Post2.216.928.242.99.8
Food additives should be avoided.Pre3.436.629.926.53.71.8360.07
Post5.935.830.923.54.0
Dietary supplements made from food items are safe.Pre4.043.629.521.21.8−10.700< 0.01
Post0.916.628.243.311.0
The efficacy of commercial dietary supplements is confirmed and reliable.Pre2.118.733.636.49.2−8.102< 0.01
Post0.99.518.146.624.9
I want to use dietary supplements that have a good reputation.Pre3.431.718.932.613.4−9.959< 0.01
Post1.58.617.944.327.7
Dietary supplements recommended by health professionals are effective.Pre0.915.922.638.522.0−7.382< 0.01
Post0.95.512.948.232.5
Dietary supplements can be used concomitantly with medicines.Pre1.28.915.044.030.9−7.215< 0.01
Post0.32.89.536.750.8
Dietary supplements can prevent diseases.Pre0.926.823.836.312.2−6.300< 0.01
Post1.516.316.041.724.5
Dietary supplements can treat diseases.Pre0.36.418.440.134.9−4.855< 0.01
Post0.03.111.340.145.6
Dietary supplements can compensate for an unbalanced diet.Pre1.824.120.738.714.6−5.168< 0.01
Post0.913.620.441.423.8
Children who are picky eaters should take dietary supplements to supplement nutrition.Pre0.614.915.243.026.2−4.440< 0.01
Post0.38.915.040.435.5
Pregnant women should take dietary supplements to supplement nutrition.Pre2.520.624.537.714.7−8.003< 0.01
Post1.212.618.738.728.8
I want to use dietary supplements for weight loss or muscle building.Pre4.022.317.132.624.1−6.342< 0.01
Post3.112.613.236.534.7
  1. Pre: pre-intervention; Post: post-intervention
  2. Statistics analyses were conducted between the pre- and post-intervention answers to the questionnaire
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