Table 1.

Baseline characteristics of the four age-groups.

	<50 years	50–64 years	65–74 years	≥75 years	P-value
N	474	1012	716	440
Demographics, n (%)
Female gender	319 (67.3%)	758 (74.9%)	527 (73.6%)	332 (75.5%)	0.011
Swiss resident	319 (67.3%)	833 (82.3%)	630 (88.0%)	393 (89.3%)	<0.001
Public insurance	389 (82.1%)	698 (69.0%)	408 (57.0%)	266 (60.5%)	<0.001
Admission data, n (%)
Emergency admission	12 (2.5%)	21 (2.1%)	16 (2.2%)	26 (5.9%)	<0.001
Tertiary hospital	431 (90.9%)	862 (85.2%)	613 (85.6%)	380 (86.4%)	0.019
Comorbidities, n (%)
Diabetes mellitus	13 (2.7%)	72 (7.1%)	80 (11.2%)	46 (10.5%)	<0.001
Congestive heart failure	2 (0.4%)	22 (2.2%)	31 (4.3%)	49 (11.1%)	<0.001
Cerebrovascular diseases	0 (0.0%)	7 (0.7%)	7 (1.0%)	2 (0.5%)	0.18
High blood pressure	53 (11.2%)	264 (26.1%)	287 (40.1%)	196 (44.5%)	<0.001
Cancer	0 (0.0%)	13 (1.3%)	9 (1.3%)	8 (1.8%)	0.056
Coronary artery disease	2 (0.4%)	19 (1.9%)	36 (5.0%)	49 (11.1%)	<0.001
Renal insufficiency	9 (1.9%)	33 (3.3%)	44 (6.1%)	59 (13.4%)	<0.001
COPD	2 (0.4%)	19 (1.9%)	16 (2.2%)	9 (2.0%)	0.1
CCI, mean (s.d.)	0.10 (0.58)	0.23 (0.66)	0.39 (0.93)	0.58 (1.05)	<0.001
Specific comorbidities, n (%)
Symptomatic HPT	44 (9.3%)	203 (20.1%)	179 (25.0%)	139 (31.6%)	<0.001
Osteoporosis	32 (6.8%)	167 (16.5%)	140 (19.6%)	93 (21.1%)	<0.001
Urolithiasis	6 (1.3%)	7 (0.7%)	4 (0.6%)	2 (0.5%)	0.44
Vitamine D deficiency	42 (8.9%)	72 (7.1%)	46 (6.4%)	41 (9.3%)	0.2

CCI, Charlson comorbidity Index; COPD, chronic obstructive pulmonary disease; HPT, hyperparathyroidism.