Table 2. Factors associated with available PTH levels within 6 months of chronic hypercalcemia (n=7,675).

Covariate	Odds ratio (95% CI)	P value
Age		<0.001
<30 years	Reference
30–39 years	2.4 (1.3–4.4)	0.006
40–49 years	3.2 (1.8–5.6)	<0.001
50–59 years	2.8 (1.6–4.7)	<0.001
60–69 years	2.0 (1.2–3.5)	0.009
70–79 years	2.0 (1.2–3.5)	0.01
≥80 years	1.9 (1.1–3.3)	0.02
Sex		<0.001
Male	Reference
Female	1.4 (1.2–1.6)	<0.001
Insurance status		0.02
Commercial	Reference
Medicare	0.86 (0.73–1.0)	0.09
Medicaid	0.69 (0.55–0.88)	0.002
Other/uninsured/unknown	0.85 (0.68–1.1)	0.17
Laboratory values
Calcium		<0.001
<11.0 mg/dL	Reference
11.1–11.5 mg/dL	2.8 (2.5–3.3)	<0.001
11.6–12.0 mg/dL	3.9 (3.2–4.7)	<0.001
>12.0 mg/dL	1.7 (1.3–2.1)	<0.001
Creatinine	0.84 (0.71–0.99)	0.04
Indications for surgery
Kidney stones	1.8 (1.5–2.1)	<0.001
Osteoporosis	3.1 (2.7–3.5)	<0.001
Bone fracture	0.85 (0.66–1.1)	0.23

PTH, parathyroid hormone; CI, confidence interval.