In this study, we extracted data from the patients medical record within the cohort to compare five existing frailty indices: the 5-Item Modified Frailty Index (mFI-5), the Electronic Frailty Index (eFI), the Frailty Index based on Comprehensive Geriatric Assessment (FI-CGA), the Frailty Risk Assessment Instrument for the Elderly based on Laboratory and Clinical Indicators (FRAIL), and the Hospital Frailty Risk Score (HFRS). The study aims to evaluate the predictive values of each electronic frailty index for the incidence of postoperative infection-related adverse events. This includes the primary outcome of infection events occurring within 30 days and the secondary outcome of the correlations among the five frailty indices.

Inclusion Criteria:

1. Aged 65 and above
2. Patients who underwent Non-Cardiac surgeries and anesthesia

Exclusion Criteria:

1. Patients who underwent surgery within 30 days before the current procedure;
2. Patients with missing baseline demographic data;
3. Patients with incomplete medical records that resulted in the inability to fully assess all five frailty indices;
4. Patients with missing data related to primary and secondary outcomes after surgery.

The patients aged 65 and older who were involved in the prospective cohort of postoperative adverse events in elderly patients from April 2020 to April 2022.