Thanks for the customers who have this worries,as it can help me to make clear about our quantum resonance megnetic analyzer in the front of all our customers.That's nice.Everyone who had bought or have known something about our analyzer should know that,our analyzer is upgrading in a period time according to customer's requirements.So regarding the 31reports,it just add obesity based on the 30reports.You can be assured of that,all our analyzer are the authorized version.They just differ in the items.So somebody will be confused,now that they are same aside from obesity,which one is better?My answer to the question is 31reports ,as ours are the authorized version,and very accurate,so if add more items,the accuracy will correspondingly  be added.As it'll help us know more overall details of  our health status.Don't you think so?Good luck to you.May you make a wise choice.