Table 2.

Comparison of mean PAOI values according to clinical severity.

Clinical severity	Mean difference	Std. error	95% CI	P value
High-intermediate	13.91	3.04	6.15–21.66	<0.001
High-low	26.24	3.36	17.82–34.67	<0.001
Intermediate-low	12.33	2.73	5.69–18.96	<0.001