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. 2020 Jul 13;15(7):e0236025. doi: 10.1371/journal.pone.0236025

Table 1. Quality assessment questions for risk of bias based on study limitations in observational studies.

Design/Methods
Sample
 Size justified?
 Inclusion criteria clear?
 Exclusion criteria clear?
Measurement
 Conditions clearly described?
 Blind assessment?
 Timing/menstrual phases clearly defined?
 Menstrual phases verified?
Control of confounders
 Caffeine?
 Smoking?
 Medications?
 Environmental temperature?
 Exercise?
 Other?