Figure 2. Forest Plot of Cross-sectional Studies on Association Between Sleep-Disordered Breathing and Cognitive Domains.

All effect estimates were pooled using a weighted random-effects model. Error bars indicate 95% CIs. SMD indicates standard mean difference. A, Forest plot of association between sleep-disordered breathing and global cognition. Heterogeneity: Τ² = 0.00; χ² = 13.35; df = 5; P = .02; I² = 63%. Test for overall effect: z = 0.59; P = .56. B, Forest plot of association between sleep-disordered breathing and executive function. Heterogeneity: Τ² = 0.00; χ² = 9.00; df = 6; P = .17; I² = 33%. Test for overall effect: z = 1.92; P = .05. C, Forest plot of association between sleep-disordered breathing and delayed memory. Heterogeneity: Τ² = 0.00; χ² = 2.34; df = 4; P = .67; I² = 0%. Test for overall effect: z = 0.37; P = .71.