Zohaib Khan

12 Questions 9 Answers 0 Followers

Questions related from Zohaib Khan

Can someone please point me in the direction of documented instances of partcipants' refusal to sign consent form but verbally consenting?

As a part of study on the tobacco retail environment, our study participants were reluctant to sign the consent for (Written Informed Consent) but gave a verbal consent to participate int he...

02 June 2020 8,277 0 View

In the wake of COVID-19, should we allow research data entry remotely ?

So most universities around the globe have been shutdown in these strange and testing times. Researchers, particularly those from the developing countries face a unique dilemma; Having collected...

24 March 2020 1,477 8 View

How should one choose the number of clusters in the first stage of multistage random cluster sampling ?

I have to recruit a sample of 300 secondary sampling units (elements) from X number of Clusters ( primary sampling units), how do I determine X when my primary sampling frame has 93 clusters. I...

19 June 2018 3,276 5 View

How to interpret these very wide confidence intervals from a case control study?

We conducted an age and sex matched case control study (84 cases, 174 controls). The outcome was cancer X and the exposure of interest was Y. Sample size was calculated based on the prevalence of...

18 September 2016 9,397 7 View

Do you know of a systematic review of observational studies which used the GRADE approach for assessing the strenghth of evidence ?

I can not, despite trying for the last three hours, a systematic review and/or meta-analysis of observational studies where the the sysnthesized quantitative evidence has been evaluated by the...

04 August 2016 6,985 4 View

What is the best learning resource for epi info 7 ?

There are two large documents, the epi info user manual and the epi informatics guide but i find them a bit lacking when it comes to explaining advanced statistical analysis. I want to analyze...

02 June 2016 7,406 6 View

How to create a match variable in Epi Info 7, linking cases to controls ?

Hi all, we have a data set with 258 records (84 cases , 174 controls). We did frequency matching for age and sex during the data collection , however data entry did not involve a matched (link)...

10 May 2016 9,954 2 View

When and how were smoking pack-years", established?

Does anyone know of some related text on how and when was smoking "pack-years" established for the first time and anything on the validity of this exposure assessment method/tool? I

06 May 2015 7,940 5 View

How can one enable multiple choices (Mutually inexclusive) in epi info 7 ?

I can not seem to find any field(variable type) where I can enable multiple choices to be selected. I understand, I can make a group field and then put in check boxes for all my responses or I...

07 March 2015 6,870 3 View

How is data entry done for case control studies?

I am at the data entry stage for my project. The questionnaire for both the cases and controls is similar apart from the details for the condition of interest. I will enter data in Epi Info, what...

19 January 2015 9,453 7 View

If I have more than 150 references in a review article, how should I go about citing them?

Should I submit a supplemental bibliography? I have to include these citations because of the work I am reviewing.

07 March 2014 9,786 6 View

Which data should be used for calculating standard error of Log Odds ratio?

Currently I am doing or at least trying to do a meta-analysis of some analytical studies in the field of smokeless tobacco and cancer, a few papers have given adjusted odds ratios, now when I...

14 November 2013 5,670 1 View