Table 5 Results of the receiver operating characteristic curve analyses of TyG-BMI and TyG-WC for predicting NAFLD in subgroups of age and BMI

   > 60

0.8247

0.7778

0.8715

196.7369

0.7956

0.7531

  46–60

0.8440

0.8311

0.8569

196.4398

0.7978

0.7271

  31–45

0.9090

0.9015

0.9164

189.6580

0.8057

0.8714

  18–30

0.9258

0.8908

0.9608

172.4438

0.7599

0.9268

   ≥ 28

0.7150

0.6696

0.7604

254.8981

0.7296

0.6000

   ≥ 24, < 28

0.7070

0.6876

0.7264

216.5987

0.7008

0.5998

   < 24

0.8457

0.8335

0.8579

178.0661

0.7658

0.7776

   > 60

0.7942

0.7439

0.8445

685.9048

0.7537

0.7037

  46–60

0.8426

0.8298

0.8554

666.8453

0.7436

0.7818

  31–45

0.9080

0.9006

0.9154

625.1197

0.7995

0.8621

  18–30

0.9393

0.9110

0.9676

619.1378

0.8493

0.9024

   ≥ 28

0.7346

0.6891

0.7800

806.3716

0.7547

0.6186

   ≥ 24, < 28

0.7099

0.6906

0.7292

711.0072

0.6313

0.6988

   < 24

0.8528

0.8413

0.8643

620.9366

0.7500

0.8153