Association between admission albumin levels and 30-day readmission after hip fracture surgery in geriatric patients: a propensity score-matched study

Table 4 Unadjusted and adjusted association between admission albumin levels and 30-day readmission

Type	Albumin level (g/L)	Events, n (%)	Unadjusted OR	p* trend 1	Multivariable Regression adjusted OR	p* trend 2	PSM adjusted OR	p* trend 3
Continuous	Per 1	NA	1.112(1.075–1.149)	< 0.001	1.064(1.020–1.111)	0.003	NA	NA
Cutoff value	≥ 35	119(11.7)	1 [Reference]	< 0.001	1 [Reference]	0.001	1 [Reference]	0.003
Cutoff value	< 35	67(26.2)	2.666(1.902–3.738)	< 0.001	1.974(1.340–2.910)	0.001	2.090(1.296–3.370)	0.003
Clinical threshold	C1(≥ 35)	119(11.7)	1 [Reference]	NA	1 [Reference]	NA	1 [Reference]	NA
	C2(34.9–30)	47(24.5)	2.438(1.666–3.567)	< 0.001	2.015(1.311–3.099)	0.001	1.908(1.117–3.259)	0.018
	C3(29.9–25)	18(31.6)	3.471(1.924–6.264	< 0.001	2.198(1.106–4.369)	0.004	1.791(0.687–4.671)	0.233
	C4(≤ 24.9)	2(28.6)	0.332(0.064–1.732)	0.191	0.586(0.099–3.474)	0.556	NA^#	NA^#
Quartile	Q1(< 35)	67(26.2)	1 [Reference]	NA	1 [Reference]	NA	1 [Reference]	NA
	Q2(35.0–37.9)	48(16.0)	0.538(0.355–0.803)	0.003	0.599(0.378–0.951)	0.029	0.621(0.370–1.041)	0.070
	Q3(38.0–40.9)	34(9.9)	0.311(0.198–0.489)	< 0.001	0.380(0.225, 0.641)	0.004	0.378(0.199–0.717)	< 0.001
	Q4(≥ 41)	37(9.9)	0.312(0.201–0.483)	< 0.001	0.515(0.293–0.908)	0.022	0.465(0.211–0.859)	0.047

The factors of the multivariable regression: Age, Stroke, Intracerebral hemorrhage, ASA classification, Blood glucose, Albumin, Pneumonia
CI confidence interval, OR odds ratio, PSM propensity scores matching
^*P for trend; NA^#, The number of individuals in the C4 group is too small to conduct propensity score matching

ISSN: 1471-2474