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The majority of studies showed that salmonid embryo survival rates decreased as the percentage of fine sediments in stream substrate increased . The majority of studies indicate that there is a 30 % to 60 % overlap between child maltreatment and woman battering in families . So far , the majority of studies have focused on MDMA users who have been abstinent for a period of a few weeks to a few months - longer-term studies have been planned or are underway - and these have shown that the adverse psychiatric and cognitive changes associated with MDMA use are persistent . The majority of studies included both men and women with participant numbers ranging from six to 508 . The majority of studies have demonstrated a benefit , and most urologists use them routinely .