Methods | Randomised control trial. The trial was conducted in the United States of America. |
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Participants | 34 healthy, normotensive adolescents. Ethnicity: African‐American. Age:14 ‐ 19 years. |
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Interventions | Intervention: 1.5 grams of calcium per day. Control group: daily placebo tablets. Trial duration: 4 weeks. |
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Outcomes | Ambulatory systolic blood pressure and diastolic blood pressure. | |
Notes | There is no information of calcium intake reported. Participants were recruited from a high school in Los Angeles. |
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Risk of bias | ||
Bias | Authors' judgement | Support for judgement |
Random sequence generation (selection bias) | Unclear risk | The authors reported that participants were randomly assigned to the treatment or control group. |
Allocation concealment (selection bias) | Unclear risk | Not described |
Blinding of participants and personnel (performance bias) All outcomes | Unclear risk | Not described |
Blinding of outcome assessment (detection bias) All outcomes | Low risk | The ambulatory blood pressure unit measured the blood pressure every 30 minutes during the day. "Unit was placed on each participant for 24 hours." |
Incomplete outcome data (attrition bias) All outcomes | Unclear risk | Not reported from how many participants gave data for the results |
Selective reporting (reporting bias) | Low risk | The planned outcome was reported. |
Other bias | Unclear risk | No information of baseline characteristics was reported. |