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Table 2 Backward stepwise (Wald) regression analyses

From: Low skeletal muscle area is a risk factor for mortality in mechanically ventilated critically ill patients

  Muscle area (continuous) (per 10 cm2) Low-muscle area versus normal Low and medium muscle area versus high
  Low < 110 cm2for females Low <110 cm2
Low < 170 cm2for males Medium 110 to 170 cm2
High >170 cm2
Step 1 OR 95% CI P value OR 95% CI P value OR 95% CI P value
Muscle area 0.82 .73 – .93 .001 3.86 1.80 – 8.26 .001 2.93 1.58 – 5.42 .001
Sex 1.50 .67 – 3.34 .320 .54 .29 – 1.01 .053 1.43 .66 – 3.09 .365
BMI 0.96 .89 – 1.03 .268 .95 .88 – 1.03 .222 .96 .89 – 1.03 .238
APACHE II score 1.06 1.03 – 1.11 .001 1.07 1.03 – 1.11 .001 1.07 1.03 – 1.11 .001
Admission diagnosis 0.96 .85 – 1.10 .577 .97 .85 – 1.11 .666 .97 .85 – 1.10 .625
Constant 3.01   .341 .16   .118 .02   .012
Step 3 or 4          
Muscle area 0.84 .77 – .92 <.001 4.27 2.03 – 9.00 <.001 2.71 1.69 – 4.34 <.001
Sex     .50 .27 – .92 .025    
APACHE II score 1.06 1.02 – 1.1 7 .002 1.07 1.03 – 1.11 .001 1.07 1.03 – 1.11 .001
Constant 0.83   .812 .04   <0.001 .01   <.001