Usefulness of nutritional assessment using Geriatric Nutritional Risk Index as an independent predictor of 30-day mortality after hip fracture surgery

•We examined the usefulness of the nutritional status assessed by the GNRI and identified cutoff scores that predict mortality risk.•The GNRI cutoff score for 30-day mortality was 75.4. We examined the usefulness of the nutritional status assessed by the GNRI and identified cutoff scores that predict mortality risk.•The 30-day mortality rate of the group with GNRI score≤75.4 was 12.8% and that of the group with GNRI score>75.4 was 0.6%.