Fig. 3
Sex differences in sleep parameters, by brain wave frequencies. Labels indicates the parameter investigated in the studies: A, amplitude; C1, coherence; C2, mutual information; C3, weighted-phase lag index; D’, density; D1, power density; D2, change in power density; D3, density peak; P’, power; P1 relative power; P2, change in power; P3, normalized activity. Color indicates sex differences in sleep marker values: females greater (pink), males greater (blue), no difference (yellow). Length of bars corresponds to number of PROGRESS-Plus parameters considered in statistical analysis of the study, shown as a superscript: G, gender/sex; + , plus (additional parameters, shown in parentheses). Line style corresponds to Quality Assessment of the study: Excellent (+ + , thick solid lines), Good (+ , medium dashed lines), Fair (-, thin dotted lines)