Table 2 Dictionary of variables used in the review
From: Helicobacter pylori infection and circulating ghrelin levels - A systematic review
Variable | Coding scheme |
|---|---|
Study Team | A, B, C etc |
Design | Cohort, Cross-sectional, Case control, Experimental |
Healthy | Healthy only, Sick only, Both |
Region | Asia, Africa, Europe, North America, South America |
Gender | Male only, Female only, Both |
Age | Children only, Adults only, Both |
Number of methods used to assess H pylori | One method; two or more methods |
Type of ghrelin assay used | Commercial RIA, in-house RIA, Commercial ELISA, Commercial EIA |
Sample storage | -70°C and below; above -70°C |
Sample type | Serum; Plasma |
Weight | Normal, Low, Various, High |
Difference in circulating ghrelin concentration between H pylori + & - subjects | Lower, no difference, higher |
Changes in circulating ghrelin after cure | Increased, decreased, no change |
Duration of follow-up | 4 weeks & below; Above 4 weeks |
Sample size | Two categorizations were done: 1) 50 & below, 51-200, 201 and above; 2)Above 20, Below 20 |