Comparison of a Minimally Invasive Tissue-Sparing Posterior Superior (TSPS) Approach and the Standard Posterior Approach for Hip Replacement

Table 3

Multiple regression analysis considering postoperative day 1 and day 2 Hb levels and LOS as the main outcomes.

Variables	Hb						LOS (days)
	Day 1 (g/dl)			Day 2 (g/dl)
	Coeff	SE	value	Coeff	SE	value	Coeff	SE	value
Age (y)	+0.034	0.015	0.0300	+0.003	0.022	0.9051	-0.014	0.035	0.6821
Sex (F)	-0.318	0.354	0.3762	-0.473	0.655	0.4807	-0.554	0.824	0.5068
ASA classification	-0.304	0.361	0.4057	+0.386	0.577	0.5130	+0.488	0.840	0.5659
BMI (kg/m^2)	-0.072	0.050	0.1588	-0.072	0.071	0.3234	+0.071	0.117	0.5455
TSPS approach	-1.410	0.296	0.0001	-1.539	0.467	0.0046	+3.580	0.690	0.0001
Preoperative Hb (g/dl)	+0.659	0.120	0.0001	+0.783	0.206	0.0015	-0.382	0.288	0.1831

Statistically significant predictors () are marked in bold and with . Abbreviations: Coeff: coefficient; SE: standard error; F: female; Hb: hemoglobin; LOS: length of stay; F: female; BMI: body mass index; TSPS: tissue-sparing posterior superior; ASA: American Society of Anesthesiologists.