Correlation between the difference in overnight pKt/V (A) or pCrCl (B) and the change in AHI following conversion from NPD to CAPD. pKt/V, peritoneal Kt/V; pCrCl, peritoneal creatinine clearance; AHI, apnea-hypopnea index. Correlation between the difference in overnight pKt/V (A) or pCrCl (B) and the change in AHI following conversion from NPD to CAPD. pKt/V, peritoneal Kt/V; pCrCl, peritoneal creatinine clearance; AHI, apnea-hypopnea index. Sydney C. W. Tang et al. CJASN 2009;4:410-418 ©2009 by American Society of Nephrology