Table 5.
Threshold effect analysis of systemic immune-inflammation index and serum ferritin stratified by race.
| RACE | Mexican American | Non-Hispanic White | Non-Hispanic Black | Other Hispanic | Other Race |
|---|---|---|---|---|---|
| Model 1, β (95% CI) | |||||
| Linear effect model | −0.01 (−0.04, 0.03) 0.7136 | −0.03 (−0.05, −0.01) 0.0072 | −0.02 (−0.05, 0.01) 0.1981 | −0.04 (−0.08, −0.00) 0.0294 | −0.02 (−0.06, 0.01) 0.2251 |
| Model 2, β (95% CI) | |||||
| Inflection point (K) | 291.85 | 875.08 | 930.22 | 954.39 | 314.89 |
| < K | 0.18 (−0.19, 0.55) 0.3332 | −0.04 (−0.07, −0.01) 0.0101 | −0.05 (−0.08, −0.01) 0.0181 | −0.02 (−0.07, 0.03) 0.4265 | −0.47 (−0.67, −0.27) <0.0001 |
| > K | −0.01 (−0.05, 0.03) 0.4728 | −0.00 (−0.06, 0.06) 0.9751 | −0.08 (−0.02, 0.18) 0.1015 | −0.16 (−0.31, −0.00) 0.0470 | 0.02 (−0.02, 0.06) 0.2582 |
| LLR | 0.303 | 0.36 | 0.033 | 0.128 | <0.001 |
Model 1: Linear effects model; Model 2: Non-linear effects model.
In the subgroup analysis stratified by each covariate, the model is not adjusted for the stratification variable itself.