Table 2.

Rate ratio of parathyroidectomy by era (2006–2009, 2010–2013, and 2014–2016) after adjusting for age, sex, race, poverty, being listed, region, time to initiation of treatment, and comorbidities (diabetes mellitus, hypertension, heart failure, coronary artery disease, cardiovascular disease, peripheral vascular disease, cancer, chronic obstructive pulmonary disease, and functional impairment) for Secondary Hyperparathyroidism (SHPT).

Era	Rate ratio	P-value
2006–2009	Reference
2010–2013	1.52 (1.39–1.65)	< 0.001
2014–2016	2.06 (1.90–2.24)	< 0.001