It could be obtained by using the following formula: Standard deviation of difference: Here the standard deviation of the difference scores has to be calculated.Mean difference: It is obtained by carrying out simple subtraction of post mean from the pre mean.Note: The different calculations to be performed for obtaining the data as per the requirement of the format have been shown below. Figure 2 : Interface for the selected data entry format for meta-analysis in CMA Also, the effect measures to be calculated are same as in the previous article as the outcome is continuous. However this format offers no option for customizing the field names and the columns have already been named as per the data to be entered. The figure below shows the interface of the spreadsheet pertaining to the ‘Mean difference, Standard Deviation of difference and sample size’ format in ‘One group (pre-post)’ directory. Figure 1: Effect size data directory for ‘One group (Pre-post) and matched groups’ for meta-analysis in CMA Select any of the formats as per their preference and available data. The encircled format is the desired format for present demonstration. The figure below shows the effect size data directory for ‘One group (Pre-post) and matched groups’. In the present Obsessive-Compulsive Disorder (OCD) case study, the patients were administered drug treatment and their pre-post treatment scores were measured over CY-BOCS scale. Also, the evaluations are carried out by measuring the patient condition before and after the treatment (Marsden & Torgerson 20152).
One group (pre-post) design includes administration of the treatment to the single group of patients.
Here, the degree of correlation has particular importance, because it influences the degree of impact between the matched participants (White & Sabarwal 2014). This tends to reduce error and increase statistical significance of results. One member from each pair is assigned to different groups, thus each pair serves as its own control. In matched group design, the unit of analysis is the pair of participants who have been matched on the basis of a particular attribute as deemed fit by the researcher.
One group and matched group designs in Meta-analysis For this purpose, the single group of patients who were administered drug treatment will be taken into consideration. Therefore this article explains the data entry methodology, for performing meta-analysis on the outcomes of studies having a single group.
#COMPREHENSIVE META ANALYSIS 3 HOW TO#
The previous article, explained how to enter data for performing meta-analysis of the studies reporting comparison data.