| Collection of the control group was essential for the evaluation of seropositivity among the general female population. |
| This study is a preliminary report of the case series without a control group for comparison. |
| Researchers tested their SARS vaccine on four African green monkeys, with another four in the control group. |
| Direct evaluation cannot be done because very few ganzfeld studies have included a control group. |
| Dr Duncan found that only one of the groups, the third group, showed any apparent effect in comparison with the control group. |
| Results showed a significant improvement in the iron, iodine and vitamin A status of these children compared to a control group. |
