Table 4 The NRI, IDI, and C-index of the nomograms and AJCC Stage system in OS and CSS prediction for elderly patients with EOC

NRI (vs. AJCC Stage system)

 For 3-year OS

0.220

0.173–0.250

0.207

0.147–0.279

 For 5-year OS

0.217

0.189–0.248

0.204

0.149–0.256

 For 10-year OS

0.163

0.125–0.230

0.165

0.087–0.261

 For 3-year CSS

0.230

0.194–0.259

0.192

0.154–0.269

 For 5-year CSS

0.265

0.227–0.315

0.204

0.150–0.276

 For 10-year CSS

0.247

0.180–0.298

0.190

0.135–0.294

IDI (vs. AJCC Stage system)

 For 3-year OS

0.047

0.035–0.059

 < 0.001

0.035

0.020–0.057

 < 0.001

 For 5-year OS

0.058

0.047–0.072

 < 0.001

0.042

0.029–0.062

 < 0.001

 For 10-year OS

0.047

0.035–0.067

 < 0.001

0.033

0.010–0.061

 < 0.001

 For 3-year CSS

0.041

0.031–0.055

 < 0.001

0.036

0.024–0.062

 < 0.001

 For 5-year CSS

0.056

0.041–0.074

 < 0.001

0.046

0.030–0.067

 < 0.001

 For 10-year CSS

0.053

0.037–0.075

 < 0.001

0.043

0.025–0.074

 < 0.001

C-index

 The nomogram (OS)

0.713

0.701–0.725

0.751

0.731–0.771

 The nomogram (CSS)

0.729

0.717–0.741

0.702

0.680–0.724

 The AJCC Stage (OS)

0.513

0.495–0.531

0.486

0.461–0.512

 The AJCC Stage (CSS)

0.492

0.476–0.508

0.500

0.477–0.524