- Basic characteristics of included studies (n=6).
| Included study | Year | Country | Age (Year-old) | Sample | Surgery | POD case and percentage | |||
|---|---|---|---|---|---|---|---|---|---|
| Study arm | Control arm | Study arm | Control arm | Study arm | Control arm | ||||
| Geng et al (16) | 2022 | China | 72.6±5.8 | 71.3±5.0 | 239 | 676 | Non-cardiac surgery | 38 (15.9) | 66 (9.8) |
| Takahashi et al (17) | 2021 | Japan | 70 (64-75) | 205 | 270 | NSCLC surgery | 8 (3.9) | 9 (3.3) | |
| Zhao et al (28) | 2020 | China | 75 (73-79) | Low risk 75 (72-78), no risk 74 (71-77) | 45 | 243 | Non-cardiac surgery | 14 (31.1) | 35 (14.4) |
| Lee et al (19) | 2019 | England | Moderate risk 70.3±16.2; high risk 67±16.7 | 65±16.9 | 856 | 1212 | SBO surgery | 62(19.8) | 38 (3.1) |
| Wang et al (20) | 2019 | China | Moderate risk 46.1+11.6; High risk 44.5+12.7 | Low risk 45.2+13.2; no risk 45.3+12.7 | 46 | 102 | Cardiac surgery | 3 (13.1) | 5 (10.0) |
| Kushiyama et al (21) | 2018 | Japan | 80.3±3.8 | 79.0±3.6 | 190 | 158 | Gastrectomy | 2 (1.3) | 0 |
1: GNRI = (1.489×serum albumin [g/L]) + (41.7×[current body weight / ideal body weight]); GNRI diagnostic criteria with Bouillanne O is high risk (GNRI<82), moderate risk (82≤GNRI<92), low risk (92≤GNRI≤98), and no risk (GNRI >98). GNRI: geriatric nutritional risk index SBO: small bowel obstruction, NSCLC: non-small cell lung cancer, POD: postoperative delirium