Table 1: Characteristics and comparison of the participants separated into two groups based on hypovitaminosis D (i.e., serum 25OHD ≤ 50 nmol/L).

Total cohort
Serum 25OHD concentration value*
≤50
>50

Demographical measures
 Age (years), mean SD 0.407
 Female gender, (%)169 (66.8)134 (64.7)35 (76.1)0.139
 AGGIR score (/6), mean SD 0.308
 Living at home, (%)144 (56.9)123 (59.4)21 (45.7)0.088
Clinical measures
 Main reason for admission, (%) 0.822
  Gait disorders/falls/orthopaedic98 (38.7)80 (38.6)18 (39.1)
  Cardiovascular20 (7.9)17 (8.2)5 (10.9)
  Respiratory26 (10.3)22 (10.6)6 (13.0)
  Digestive17 (6.7)11 (5.3)0 (0.0)
  Neuropsychiatric47 (18.6)40 (19.3)8 (17.4)
  Social45 (17.7)37 (17.9)9 (19.6)
 Number of acute diseases, mean SD 0.059
 Number of comorbidities, mean SD 0.487
 Length of stay (days), mean ± SD 0.017
 Use of vitamin D supplements, (%)26 (10.3)10 (4.8)17 (36.9)<0.001
Biological measures
 Serum 25OHD concentration (nmol/L), mean SD <0.001
 Creatinine clearance (mL/min) , mean SD 0.120

25OHD: 25-hydroxyvitamin D; SD: standard deviation; AGGIR: Autonomy, Gerontology, Iso-Resources Groups.
Comparisons based on the Chi-square test or Student's t-test, as appropriate.
Diseases lasting at least 3 months or running a course with minimal change.
Number of hospitalization days in the geriatric acute care unit.
Calculated from the Cockcroft formula [(140−age years) × weight kg/ ] × 1.04 for females, and × 1.25 for males.
significant (i.e., <0.05) is indicated in bold.