Table 3.

Comparison of complications and adverse events between groups A [Ankylosing Spondylitis (AS)] and B (Non-AS).

	Group A (AS; n = 501)	Group N (Non-AS; n = 367,389)	Odds Ratio	95% Confidence Interval	p value
Acute Renal Failure	15 (2.9%)	9115 (2.5%)	1.21	0.73; 2.03	0.47
Myocardial Infarction	∗∗	141 (0.01%)	5.21	0.73, 37.30	0.18
Anemia	109 (21.8%)	43,352 (11.8%)	1.47	1.06, 2.04	0.020
Pneumonia	∗∗	972 (0.3%)	0.75	0.10, 5.37	1.00
Need for blood transfusions	16 (3.2%)	12,886 (3.5%)	0.91	0.55, 1.49	0.79
Pulmonary Embolism	0	475 (0.1%)	0.99	0.99, 0.99	1.00
Deep Venous Thrombosis	∗∗	560 (0.2%)	2.62	0.65, 10.55	0.18
Peri-prosthetic fracture	∗∗	4420 (1.2%)	0.83	0.34, 1.99	0.84
Prosthetic dislocation	∗∗	5145 (1.4%)	0.85	0.38, 1.91	0.85
Peri-prosthestic mechanical complications	∗∗	2850 (0.8%)	1.55	0.69, 3.47	0.29
Peri-prosthetic infection	12 (2.4%)	3819 (1%)	2.34	1.32, 4.15	0.007
Mortality during hospitalisation	0	332 (0.1%)	0.99	0.99, 0.99	1.00

∗∗- Numbers between 1 and 10 were not reported as per Healthcare cost and utilization project (HCUP) data use agreement.