Table 3.
Characteristics of the study population stratified according to serum 25(OH)D levels
| Total N | Deficiency (<25 nmol/L) | Insufficiency (25-50 nmol/L) | Suboptimal (50–75 nmol/L) | Sufficiency (>75 nmol/L) | P value | |
| Total population | 30 023 | 1655 (5.5%) | 6824 (22.7%) | 9467 (31.5%) | 12 077 (40.2%) | |
| Sex | ||||||
| Female | 18 688 | 884 (4.7%) | 3920 (21.0%) | 5836 (31.2%) | 8048 (43.1%) | <0.0001 |
| Male | 11 302 | 770 (6.8%) | 2899 (25.7%) | 3622 (32.0%) | 4011 (35.5%) | |
| Age | ||||||
| 20–29 | 3099 | 217 (7.0%) | 875 (28.2%) | 1054 (34.0%) | 953 (30.8%) | |
| 30–39 | 3721 | 236 (6.3%) | 991 (26.6%) | 1242 (33.4%) | 1252 (33.7%) | |
| 40–49 | 3570 | 227 (6.4%) | 954 (26.7%) | 1163 (32.6%) | 1226 (34.3%) | <0.0001 |
| 50–59 | 4131 | 214 (5.2%) | 995 (24.1%) | 1320 (32.0%) | 1602 (38.7%) | |
| 60–69 | 4277 | 204 (4.8%) | 862 (20.1%) | 1354 (31.7%) | 1857 (43.4%) | |
| >70 | 11 225 | 557 (5.0%) | 2147 (19.1%) | 3334 (29.7%) | 5187 (46.2%) | |
| Medical specialty | ||||||
| AMU | 1690 | 154 (9.1%) | 352 (20.8%) | 480 (28.4%) | 704 (41.7%) | |
| BOE | 1053 | 37 (3.5%) | 212 (20.1%) | 358 (34.0%) | 446 (42.4%) | |
| EMER | 1656 | 122 (7.4%) | 392 (23.7%) | 460 (27.8%) | 682 (41.2%) | |
| ENDO | 1229 | 42 (3.4%) | 221 (18.0%) | 417 (33.9%) | 549 (44.7%) | |
| GAST | 1574 | 76 (4.8%) | 426 (27.1%) | 502 (31.9%) | 570 (36.2%) | <0.0001 |
| NEPH | 1261 | 86 (6.8%) | 336 (26.6%) | 405 (32.1%) | 434 (34.4%) | |
| NEUR | 654 | 33 (5.0%) | 120 (18.3%) | 209 (32.0%) | 292 (44.6%) | |
| ORTH | 1080 | 72 (6.7%) | 215 (19.9%) | 376 (34.8%) | 417 (38.6%) | |
| OTHER | 14 214 | 859 (6.0%) | 3456 (24.3%) | 4462 (31.4%) | 5437 (38.3%) | |
| PRIV | 5612 | 174 (3.1%) | 1094 (19.5%) | 1798 (32.0%) | 2546 (45.4%) | |
| Season of measurement | ||||||
| Summer (Dec–Feb) | 5588 | 168 (3.0%) | 901 (16.1%) | 1847 (33.1%) | 2672 (47.8%) | <0.0001 |
| Autumn (Mar–May) | 8366 | 266 (3.2%) | 1570 (18.7%) | 2732 (32.7%) | 3798 (45.4%) | |
| Winter (Jun–Aug) | 8320 | 625 (7.5%) | 2324 (27.9%) | 2545 (30.6%) | 2826 (34.0%) | |
| Spring (Sep–Nov) | 7749 | 596 (7.7%) | 2029 (26.2%) | 2343 (30.2%) | 2781 (35.9%) | |
| Year of measurement | ||||||
| 2014 | 8063 | 277 (3.4%) | 1794 (22.2%) | 2662 (33.0%) | 3330 (41.3%) | <0.0001 |
| 2015 | 7620 | 310 (4.1%) | 1669 (21.9%) | 2530 (33.2%) | 3111 (40.8%) | |
| 2016 | 7401 | 523 (7.1%) | 1700 (23.0%) | 2267 (30.6%) | 2911 (39.3%) | |
| 2017 | 6939 | 545 (7.9%) | 1661 (23.9%) | 2008 (28.9%) | 2725 (39.3%) | |
| Vitamin D supplementation | ||||||
| Yes | 2588 | 63 (2.4%) | 294 (11.4%) | 786 (30.4%) | 1445 (55.8%) | <0.0001 |
| No information | 27 435 | 1592 (5.8%) | 6530 (23.8%) | 8681 (31.6%) | 10 632 (38.8%) |
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.