Table 2.

Data extraction plan

Category	Variables for extraction
Basic information	Author name, year of publication, country, language, study type.
Research question(s)	Objectives, research questions.
Participant characteristics	Number of patients in the study, the number of patients with micronutrient deficiency among T2D patients/events and other important details like gender, age group.
Intervention/exposure characteristics	Intervention/exposure name, intervention description.
Study design	Cross-sectional, observational studies and RCTs.
Outcomes	Primary outcome variables are the burden (prevalence/incidence) of multiple micronutrient deficiencies in T2D patients. Effect of multiple micronutrient deficiencies on glycaemic control/glycaemic variability/postprandial glucose/fasting blood glucose/insulin insensitivity in T2D patients.
Measures	Prevalence or incidence of micronutrient deficiency among T2D patients. Risk ratio/Odds Ratio for glycaemic control among T2D patients with micronutrient deficiency measured by HbA1c, fasting blood sugar, postprandial blood sugar.

RCTs, randomised control trials; T2D, type 2 diabetes.