Relationship between preoperative red blood cell distribution width and postoperative pneumonia in elderly patients with hip fracture: a retrospective cohort study

Table 5 Effect size of preoperative RDW on POP in prespecified and exploratory subgroups

Characteristics	No. of patients	OR (95% CI)	P for interaction
Age			0.6675
60–73	472	1.45 (1.02, 2.05)
74–81	457	1.18 (0.86, 1.61)
82–108	515	1.23 (1.04, 1.46)
Sex			0.7661
Male	389	1.28 (1.02, 1.60)
Female	1055	1.33 (1.13, 1.57)
Comorbidity	1042	1.29 (1.12, 1.50)	0.8063
Coronary heart disease	190	1.41 (1.07, 1.85)	0.5415
Stroke	257	1.52 (1.17, 1.97)	0.2313
Parkinson’s disease	33	1.14 (0.31, 4.20)	0.8137
WBC count			0.1311
≤ 7.99	464	1.42 (1.12, 1.81)
8.00–9.99	394	1.54 (1.20, 1.97)
≥ 10.00	586	1.12 (0.90, 1.40)
MLR			0.0967
≤ 0.366	480	1.59 (1.29, 1.97)
0.367–0.566	482	1.17 (0.88, 1.55)
≥ 0.567	482	1.18 (0.94, 1.48)
NLR			0.7724
≤ 4.32	481	1.43 (1.10, 1.87)
4.33–6.99	480	1.29 (1.02, 1.64)
≥ 7.00	483	1.27 (1.04, 1.55)
Hemoglobin			0.1695
≤ 108	464	1.28 (1.07, 1.53)
108–124	473	1.01 (0.71, 1.43)
≥ 125	507	1.59 (1.15, 2.20)
Albumin			0.4294
≤ 37.0	441	1.25 (1.03, 1.52)
37.1–39.4	515	1.14 (0.84, 1.56)
≥ 39.5	488	1.47 (1.14, 1.89)
AGR			0.6146
≤ 1.29	481	1.24 (1.05, 1.47)
1.30–1.42	481	1.42 (1.07, 1.90)
≥ 1.43	482	1.14 (0.79, 1.66)
Serum creatinine			0.9036
≤ 56.9	480	1.28 (0.97, 1.68)
57–73.8	480	1.27 (0.99, 1.62)
≥ 73.9	484	1.35 (1.10, 1.66)
Blood urea nitrogen			0.2690
≤ 3.81	475	1.09 (0.81, 1.48)
3.82–6.19	481	1.50 (1.17, 1.93)
≥ 6.20	488	1.31 (1.07, 1.60)
ASA classification			0.3382
≤ 2	624	1.43 (1.12, 1.84)
≥ 3	820	1.24 (1.05, 1.45)
Intraoperative blood loss			0.4680
≤ 149	471	1.19 (0.95, 1.48)
150–299	420	1.43 (1.15, 1.79)
≥ 300	553	1.37 (1.04, 1.81)
ICU admission	31	1.58 (0.93, 2.66)	0.3819

WBC White blood cell; MLR Monocyte lymphocyte ratio; NLR Neutrophil lymphocyte ratio; AGR Albumin–globulin ratio; ASA American Society of Anesthesiologists; ICU Intensive care unit

ISSN: 1749-799X