Table 2.
Data extraction framework
| No. | Main category | Subcategory | Description |
| 1 | Authors | ||
| 2 | Title | ||
| 3 | Year of the publication | ||
| 4 | Type of study | Specify the study approach, for example, case-control, cross sectional etc | |
| 5 | Objectives | Main/broad | Describes key objective stated in the article |
| Specific | Describes the specific objectives stated in the article | ||
| 6 | Country of study | Geographical area | Country of the study participants, area of the country where the study participants were recruited |
| 7 | Study setting | Community based/hospital based | Specify the environment where the study has been conducted |
| 8 | Sample size | If case-control—cases, controls | Specify the number of participants included in the study |
| 9 | Description of study population | By gender | Specify the age group included in the study |
| By age | Specify the male to female ratio in the study sample | ||
| By ethnic background | Specify the ethnicity of the study participants | ||
| By socio-economic background | Specify the socio-economic background of the study participants | ||
| 10 | Criteria for study participant selection | Inclusion criteria | Specify the inclusion criteria considered in the study |
| Exclusion criteria | Specify the exclusion criteria considered in the study | ||
| 11 | Key findings | Disease prevalence/case detection | Specify the prevalence of gallstones identified by the study |
| Clinical presentations | Specify the clinical presentations and laboratory investigation findings of the study participants | ||
| Diagnostic approaches | Specify the method/s used for the diagnosis | ||
| Environmental risk factors | Specify the environmental risk factors identified | ||
| Genetic risk factors | Specify the genetic risk factors detected in the study participants | ||
| Physical and chemical characteristics of gallstones | Specify the physical characteristics, chemical compounds and methods used to characterise gallstones | ||
| Types of gallstones according to the chemical composition | Specify the type of gallstones identified according to the physical and chemical characteristics | ||
| Treatment options | Specify the treatment options used in managing gallstone disease | ||
| 12 | Conclusions | Specify the conclusions of the study |