Table 4 The threshold effect of SII (log-transformed) on chronic bronchitis was analyzed using a two-stage phased regression model.

From: Association between systemic immune-inflammation index and chronic bronchitis: NHANES 2001–2018

Models

Adjusted OR (95% CI) a

P value

Model 1

logistic regression (the standard linear model)

1.23 (1.17, 1.30)

 < 0.001

Model 2

Inflection point

8.14

 

 < 8.14

0.89 (0.72, 1.12)

0.276

 > 8.14

1.31 (1.22, 1.40)

 < 0.001

Log likelihood ratio b

 

 < 0.001

  1. OR odds ratio, Cl confidence interval, SII systemic immune-inflammatory.
  2. aAdjusted for sex, age, race, education, marital status, poverty income ratio, body mass index, physical activity, smoke, alcohol, hypertension, diabetes and cardiovascular disease.
  3. bModel 2 compared to model 1.
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