Characteristics of the study population on vitamin D supplementation
| Vitamin D supplementation+ | No information (%) | |
| Sex | ||
| Female | 1468 (7.9%) | 17 220 (92.1%) |
| Male | 1120 (9.9%) | 10 182 (90.1%) |
| Age group | ||
| 20–29 | 93 (3.0%) | 3006 (97.0%) |
| 30–39 | 127 (3.4%) | 3594 (96.6%) |
| 40–49 | 148 (4.1%) | 3422 (95.9%) |
| 50–59 | 221 (5.3%) | 3910 (94.7%) |
| 60–69 | 327 (7.6%) | 3950 (92.4%) |
| >70 | 1672 (14.9%) | 9553 (85.1%) |
| Medical specialty | ||
| AMU | 326 (19.3%) | 1364 (80.7%) |
| BOE | 23 (2.2%) | 1030 (97.8%) |
| EMER | 211 (12.7%) | 1445 (87.3%) |
| ENDO | 129 (10.5%) | 1100 (89.5%) |
| GAST | 114 (7.2%) | 1460 (92.8%) |
| NEPH | 184 (14.6%) | 1077 (85.4%) |
| NEUR | 36 (5.5%) | 618 (94.5%) |
| ORTH | 91 (8.4%) | 989 (91.6%) |
| OTHER | 1422 (10.0%) | 12 792 (90.0%) |
| PRIV | 52 (0.9%) | 5560 (99.1%) |
| Season of measurement | ||
| Summer (Dec–Feb) | 529 (9.5%) | 5059 (90.5%) |
| Autumn (Mar–May) | 672 (8.0%) | 7694 (92.0%) |
| Winter (Jun–Aug) | 697 (8.4%) | 7623 (91.6%) |
| Spring (Sep–Nov) | 690 (8.9%) | 7059 (91.1%) |
| Year of measurement | ||
| 2014 | 455 (5.6%) | 7608 (94.4%) |
| 2015 | 652 (8.6%) | 6968 (91.4%) |
| 2016 | 730 (9.9%) | 6671 (90.1%) |
| 2017 | 751 (10.8%) | 6188 (89.2%) |
Specialties with <1000 patients (except for NEUR) were placed into OTHER for analysis.
AMU, acute medical unit; BOE, breast/oncology/endocrine surgery; EMER, emergency; ENDO, endocrinology; GAST, gastroenterology; NEPH, nephrology; NEUR, neurology; ORTH, orthopaedic; PRIV, private.