Table 2 The formulations for the revised 4-variable and 9-variable CKD-EPI equations

Female

\(122 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.7}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.7}$}}} \right)^{ - 0.236} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.078} \times 0.995^{Age}\)

\(154 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.7}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.7}$}}} \right)^{ - 0.262} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.045} \times 0.996^{Age} \times 0.985^{BMI} \times BUN^{0.006} \times 0.985^{ALB} \times 0.997^{UA} \times 1.012^{HGB}\)

\(122 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.7}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.7}$}}} \right)^{ - 0.236} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.381} \times 0.995^{Age}\)

\(154 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.7}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.7}$}}} \right)^{ - 0.262} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.374} \times 0.996^{Age} \times 0.985^{BMI} \times BUN^{0.006} \times 0.985^{ALB} \times 0.997^{UA} \times 1.012^{HGB}\)

Female

\(122 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.7}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.7}$}}} \right)^{ - 0.330} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.078} \times 0.995^{Age}\)

\(154 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.7}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.7}$}}} \right)^{ - 0.320} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.045} \times 0.996^{Age} \times 0.985^{BMI} \times BUN^{0.006} \times 0.985^{ALB} \times 0.997^{UA} \times 1.012^{HGB}\)

\(122 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.7}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.7}$}}} \right)^{ - 0.330} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.381} \times 0.995^{Age}\)

\(154 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.7}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.7}$}}} \right)^{ - 0.320} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.374} \times 0.996^{Age} \times 0.985^{BMI} \times BUN^{0.006} \times 0.985^{ALB} \times 0.997^{UA} \times 1.012^{HGB}\)

Male

\(107 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.292} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.045} \times 0.996^{Age}\)

\(103 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.347} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.099} \times 0.996^{Age} \times 0.982^{BMI} \times BUN^{0.125} \times 0.949^{ALB} \times 0.996^{UA} \times 1.027^{HGB}\)

\(107 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.292} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.397} \times 0.996^{Age}\)

\(103 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.347} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.405} \times 0.996^{Age} \times 0.982^{BMI} \times BUN^{0.125} \times 0.949^{ALB} \times 0.996^{UA} \times 1.027^{HGB}\)

Male

\(107 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.358} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.045} \times 0.996^{Age}\)

\(103 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.391} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.099} \times 0.996^{Age} \times 0.982^{BMI} \times BUN^{0.125} \times 0.949^{ALB} \times 0.996^{UA} \times 1.027^{HGB}\)

\(107 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.358} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.397} \times 0.996^{Age}\)

\(103 \times \left( {{\raise0.7ex\hbox{${Scr}$} \!\mathord{\left/ {\vphantom {{Scr} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.391} \times \left( {{\raise0.7ex\hbox{${Scys}$} \!\mathord{\left/ {\vphantom {{Scys} {0.9}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${0.9}$}}} \right)^{ - 0.405} \times 0.996^{Age} \times 0.982^{BMI} \times BUN^{0.125} \times 0.949^{ALB} \times 0.996^{UA} \times 1.027^{HGB}\)