The effect of sleep on male reproductive system: A protocol for systematic review and meta analysis.

The degree of heterogeneity is according to: I 2 = 0% ∼ 40%, which may not be significant, I 2 = 30% ∼ 60%, which can indicate moderate heterogeneity; I 2 = 50% ∼ 90%, which can indicate considerable heterogeneity; I 2 = 75% ∼ 100%, considerable heterogeneity. 2.2.4 Evaluation of studying quality The physiotherapy evidence database scale [9] will be utilized by 2 independent evaluators (LXL) to evaluate 11 quality areas of each included literature.

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