Table 3. Factors associated with available PTH levels within 6 months of chronic hypercalcemia using a complete case analysis (n=4,544).

Covariate	Odds ratio (95% CI)	P value
Age		0.003
<30 years	Reference
30–39 years	2.4 (1.2–4.6)	0.01
40–49 years	2.5 (1.4–4.7)	0.003
50–59 years	2.4 (1.3–4.2)	0.003
60–69 years	1.7 (0.94–2.9)	0.08
70–79 years	1.8 (1.003–3.1)	0.049
≥80 years	1.7 (0.96–3.1)	0.07
Sex		<0.001
Male	Reference
Female	1.4 (1.2–1.6)	<0.001
Insurance status		0.005
Private	Reference
Medicare	0.84 (0.70–1.02)	0.07
Medicaid	0.62 (0.5–0.8)	<0.001
Other/uninsured/unknown	0.86 (0.7–1.1)	0.22
Laboratory values
Calcium		<0.001
<11.0 mg/dL	Reference
11.1–11.5 mg/dL	2.8 (2.4–3.3)	<0.001
11.6–12.0 mg/dL	3.7 (3.0–4.6)	<0.001
>12.0 mg/dL	1.4 (1.1–1.7)	0.008
Creatinine	0.84 (0.70–1.01)	0.07
25-OH vitamin D	0.995 (0.992–0.999)	0.01
Indications for surgery
Kidney stones	1.6 (1.3–1.9)	<0.001
Osteoporosis	2.2 (1.9–2.5)	<0.001
Bone fracture	0.72 (0.55–0.94)	0.02

PTH, parathyroid hormone; CI, confidence interval.