Table III.
Mean (95% CI) vitamin D (25(OH)D in nmol/L) levels in patients according to region of origin, gender, and symptoms.
| All (n = 572) | Norway (n = 249) | Europe, America, Southeast Asia (n = 83) | Middle East, Africa and South Asia (n = 240) | |
| Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | |
| All | 47 (45–50) | 63 (60–63) | 46 (41–50) | 32 (30–35) |
| Male | 46 (42–50) | 61 (54–68) | 46 (38–54) | 34 (30–37) |
| Female | 48 (46–51) | 64 (60–67) | 45 (40–51) | 31 (28–34) |
| Headache | 35 (30–40)1 | 51 (39–63)2 | 36 (25–47)3 | 27 (22–31)4 |
| Local musculoskeletal pain | 49 (45–52) | 65 (60–70) | 49 (42–56) | 33 (30–37) |
| Fatigue and general musculoskeletal pain | 50 (46–53) | 63 (58–68) | 44 (38–51) | 32 (28–37) |
Notes: Differences in mean level of vitamin D between patients with headache and local pain were 1p < 0.001, 2p = 0.030, 3p = 0.094, 4p = 0.060. The corresponding differences between vitamin D levels in patients with headache and general pain were p < 0.001, p = 0.054, p = 0.092, and p = 0.095.