Table 2.

Major complications in patients undergoing lumbar spine surgery

Perioperative complications	Hypothyroidism N (%)	Whole non-hypothyroidism N (%)	P value	Matched non-hypothyroidism N (%)	P value
Medical complications
Sepsis	768 (0.75%)	6,170 (0.79%)	0.127	1,410 (1.39%)	< 0.001
Postoperative shock	96 (0.09%)	665 (0.08%)	0.409	260 (0.26%)	< 0.001
Postoperative delirium	1,396 (1.37%)	6,663 (0.86%)	< 0.001	2,109 (2.12%)	< 0.001
Acute cerebrovascular disease	1,035 (1.02%)	6,472 (0.84%)	< 0.001	1,560 (1.53%)	< 0.001
Acute myocardial infarction	2,689 (2.64%)	18,927 (2.45%)	< 0.001	3,137 (3.08%)	< 0.001
congestive heart failure	2,850 (2.81%)	13,566 (1.76%)	< 0.001	4,547 (4.47%)	< 0.001
Deep vein thrombosis	507 (0.49%)	3,843 (0.50%)	1.000	867 (0.85%)	< 0.001
Pneumonia	1,352 (1.33%)	9,456 (1.23%)	0.005	2,253 (2.21%)	< 0.001
Pulmonary embolism	315 (0.31%)	2,246 (0.29%)	0.309	538 (0.53%)	< 0.001
Respiratory failure	1,532 (1.51%)	8,969 (1.16%)	< 0.001	2,493 (2.45%)	< 0.001
Urinary tract infection	4,313 (4.24%)	21,452 (2.78%)	< 0.001	5,439 (5.34%)	< 0.001
Transfusion	8,895 (8.74%)	45,972 (5.96%)	< 0.001	11,173 (10.98%)	< 0.001
Wound complications
Wound infection	470 (0.46%)	3,681 (0.48%)	0.503	638 (0.63%)	< 0.001
Wound dehiscence	222 (0.22%)	1,614 (0.21%)	0.560	370 (0.36%)	< 0.001
Other complications
Deaths	168 (0.17%)	1,597 (0.21%)	0.005	457 (0.45%)	< 0.001
Prolonged LOS	39,032 (38.4%)	241,935 (31.37%)	< 0.001	45,458 (44.67%)	< 0.001