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Table 6 Comparison of knowledge about dietary supplements between current users and former or never users

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

  Pre-interventionPost-intervention 
 Strongly agree (%)Agree (%)Neither agree nor disagree (%)Disagree (%)Strongly disagree (%)Z scorep-valueaStrongly agree (%)Agree (%)Neither agree nor disagree (%)Disagree (%)Strongly disagree (%)Z scorep-valueap-valueb
Dietary supplements are safe because they are just food items.Users5.941.220.031.81.21.4510.152.415.321.247.114.1−0.4290.67< 0.01
Non-users1.736.227.229.65.4  0.815.824.548.110.8  < 0.01
Dietary supplements made from natural ingredients or herbs are safe.Users3.550.623.521.21.21.4780.143.516.525.944.79.4−0.0090.99< 0.01
Non-users2.541.730.221.14.6  1.717.029.042.310.0  < 0.01
Food additives should be avoided.Users1.235.328.229.45.9−1.3100.194.836.927.425.06.0−0.5560.580.10
Non-users4.137.030.525.52.9  6.335.432.122.93.3  0.26
Dietary supplements made from food items are safe.Users8.242.431.817.70.01.4560.152.417.628.242.49.40.8000.42< 0.01
Non-users2.544.028.622.42.5  0.416.228.243.611.6  < 0.01
The efficacy of commercial dietary supplements is confirmed and reliable.Users3.621.439.331.04.82.2030.032.46.020.248.822.60.2350.81< 0.01
Non-users1.717.731.738.310.7  0.410.717.445.925.6  < 0.01
I want to use dietary supplements that have a good reputation.Users7.135.320.025.911.81.9410.052.414.118.842.422.41.9980.05< 0.01
Non-users2.130.518.535.014.0  1.36.717.545.029.6  < 0.01
Dietary supplements recommended by health professionals are effective.Users0.023.528.231.816.52.5790.010.07.115.548.828.61.0490.29< 0.01
Non-users1.213.220.740.924.0  1.25.012.047.933.9  < 0.01
Dietary supplements can be used concomitantly with medicines.Users3.59.421.238.827.11.8000.071.23.58.236.550.60.1160.91< 0.01
Non-users0.48.712.845.932.2  0.02.59.936.850.8  < 0.01
Dietary supplements can prevent diseases.Users1.243.524.728.22.44.674< 0.011.227.114.138.818.82.3510.02< 0.01
Non-users0.821.023.539.115.6  1.712.416.642.726.6  < 0.01
Dietary supplements can treat diseases.Users0.010.722.638.128.62.0510.040.05.910.642.441.21.0600.29< 0.01
Non-users0.44.916.940.737.0  0.02.111.639.347.1  < 0.01
Dietary supplements can compensate for an unbalanced diet.Users3.545.918.823.58.25.269< 0.012.421.224.735.316.53.175< 0.01< 0.01
Non-users1.216.521.444.016.9  0.410.918.843.526.4  < 0.01
Children who are picky eaters should take dietary supplements to supplement nutrition.Users1.222.416.538.821.22.2210.030.010.620.037.631.81.3160.19< 0.01
Non-users0.412.414.844.428.0  0.48.313.241.336.8  < 0.01
Pregnant women should take dietary supplements to supplement nutrition.Users3.622.627.435.710.71.4480.152.415.320.031.830.60.6060.54< 0.01
Non-users2.119.823.638.416.1  0.811.618.341.128.2  < 0.01
I want to use dietary supplements for weight loss or muscle building.Users5.925.917.727.123.51.1570.255.99.415.343.525.91.4560.15< 0.01
Non-users3.321.016.934.624.3  2.113.712.434.037.8  < 0.01
  1. Users: students who currently use dietary supplements; Non-users: students who previously used or have never used dietary supplements
  2. Statistics analyses were conducted abetween users and non-users or bbetween pre- and post-intervention stages
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