Distribution of key characteristics in the overall North American dataset (785) and the random sample (150) of potentially eligible North American trials records.
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https://figshare.com/articles/dataset/_Distribution_of_key_characteristics_in_the_overall_North_American_dataset_785_and_the_random_sample_150_of_potentially_eligible_North_American_trials_records_/589195
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*Null hypothesis: there was no difference between the number of records identified from each of the seven databases searched for the sampled and not sampled groups. The p-value is testing that the number of records identified in at least one of the seven different databases did not differ from that of at least one other database.
创建时间：
2013-02-21
