What kind of statistics do I need to use?

As per literature search, I found that most of the systematic reviews on corticosteroid therapy in prevention of pre-term birth complications are conducted in high economic countries. I am interested to do a systematic review on corticosteroid therapy in prevention of pre-term birth complications in middle and low economic countries, where there is a high infant mortality rate due to pre term delivery. Iam completely new to this concept. Your contribution, suggestions and support is required to design, conduct and publish this study. I hope any one who are expertise in this area can help me. 

Thank you

I have performed a little experiment by applying the ASRS of 6 items to a sample of 400 consecutive attenders in nine primary care facilities. I was surprised because the proportion of positive screenings was around 20%. Adjusting this data by known sensitivity and specificity (see Ramos-Quiroga) the estimated 'true prevalence' was around 12%. However no patients in the sample (nor positive nor negative screening) has a diagnosis nor a treatment for ADHD.

Dear colleagues, what do you think about this findings?

advanced care planning (ACP): living wills, medical power of attorney, medical proxy, advanced directive

A local health service has recently introduced a, add on service to assist GPs in offering better service to people with chronic mental illness, after four years, there is need to determine whether that service is having desired outcomes.

I ask for  Arabic Version of Roe Anginal questionnaire

In France, the prescription of benzodiazepines (BZD ) is a problem . Care for patients with chronic use is difficult. In terms of public health, it is particularly relevant to avoid this situation by prescribing these treatments wisely. A thesis carried out in 2012 resulted in the design of two brief first prescription of BZD guides , one to complaints for anxiety and the other for insomnia.

How would it be possible to assess the relevance of these guides, in actual practice conditions of general practice (GP) , knowing that the conditions of research in MG do not allow a large-scale intervention study ?