Effect of admission fascia iliaca compartment blocks on post-operative abbreviated mental test scores in elderly fractured neck of femur patients: a retrospective cohort study

Table 2 Univariate analysis of predictors of post-operative high AMTS, compared with moderate or low AMTS

	Proportional odd ratios	p value	Odd ratio lower bound (95%)	Odds ratio upper bound (95%)
Received admission fascia iliaca compartment block
Yes vs. No	1.89	<0.001	1.34	2.66
Admission AMTS
High vs. Low	130.7	<0.001	83.1	205.6
High vs. Moderate	10.6	<0.001	6.6	17.0
Moderate vs. Low	12.4	<0.001	7.4	20.7
Age at event
1 year increment	0.97	0.011	0.95	0.99
5 year increment	0.86	0.011	0.77	0.97
10 year increment	0.74	0.011	0.59	0.93
Age (log)	0.09	0.010	0.01	0.55
Gender
Female vs. male	1.14	0.49	0.79	1.66
Source of admission
Residential vs. own home	0.30	<0.001	0.14	0.54
Nursing home or hospital vs. own home	0.50	0.016	0.29	0.88
Nursing home or hospital vs. residential	1.80	0.14	0.83	3.91
Comorbities
ASA 3 vs. ASA 1–2	0.72	0.09	0.50	1.05
ASA 4–5 vs. ASA 1–2	0.44	0.017	0.23	0.86
ASA 4–5 vs. ASA 3	0.61	0.13	0.32	1.16
Mode of anesthesia
GA + spinal vs. GA	0.57	0.28	0.21	1.59
Spinal vs. GA	1.21	0.43	0.75	1.96
Spinal vs. GA + spinal	2.12	0.18	0.71	6.35
Time to surgery	0.99	0.44	0.99	1.00
Time to surgery (log)	0.74	0.06	0.54	1.02
Length of stay	0.98	<0.001	0.97	0.99
Length of stay (log)	0.58	<0.001	0.45	0.75
Nottingham Hip Fracture Score (NHFS)	0.82	0.009	0.71	0.95
Type of surgery
Dynamic hip screw vs. arthroplasty	1.03	0.94	0.45	2.35
Intramedullary nailing vs. arthroplasty	1.23	0.25	0.86	1.73
Dynamic hip screw vs. intramedullary nailing	1.19	0.68	0.52	2.72

An odds ratio (OR) > 1 represents a higher probability of the primary outcome measure (post-operative AMTS ≥9 versus ≤8) according to the reference category

ISSN: 1471-2253