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Table 3 Variables included in data extraction template

From: The effect of animal versus plant protein on muscle mass, muscle strength, physical performance and sarcopenia in adults: protocol for a systematic review

General Information

 Study title

 Type of RCT (i.e. standard parallel arm; crossover; cluster)

 Start and end date; duration

 Country

 Funding source

Population and setting

 Gender

 Age group

 Focused diseases/conditions, if any

 Menopause status, if relevant

 Total number of participants

 Source/setting of the population

 Method(s) of recruitment and sampling technique

Intervention and comparator

 Protein source

 Energy content (kcal)

 Protein content (grams)

 Number of participants in each arm

 Compliance

 Dropout rate

Additional features of interventions

 Physical activity

 Supplementary micronutrients

Outcomes

 Muscle health outcomes of interest

 Measurement method

 Unit of analysis

 Time points measured

 Summary statistics at baseline and at all study time points (mean, SD, P-value, and 95% CI)