| |
Calcium intake§ < 500 mg/d
|
Calcium intake§ 500–999 mg/d
|
Calcium intake§ 1000–1499 mg/d
|
Calcium intake§ > 1499 mg/d
|
|---|
|
n
|
Serum PTH (pmol/L)
|
n
|
Serum PTH (pmol/L)
|
n
|
Serum PTH (pmol/L)
|
n
|
Serum PTH (pmol/L)
|
|---|
|
All subjects‡
|
|
Vitamin D intake (ug/d)§
|
|
< 7.0
|
86
|
6.3 (5.8, 6.9)
|
230
|
5.9 (5.6, 6.2)
|
125
|
5.8 (5.5, 6.2)
|
53
|
5.7 (5.0, 6.5)
|
|
7.0–13.9
|
44
|
6.6 (5.7, 7.4)
|
225
|
5.9 (5.7, 6.2)
|
236
|
5.9 (5.6, 6.1)
|
119
|
6.0 (5.6, 6.4)
|
|
14.0–20.9
|
15
|
7.4 (5.0, 9.8)
|
85
|
5.8 (5.4, 6.3)
|
130
|
5.6 (5.3, 6.0)
|
104
|
5.8 (5.3, 6.2)
|
|
> 20.9
|
16
|
5.7 (4.5, 6.9)
|
143
|
5.7 (5.4, 6.1)
|
151
|
5.4 (5.0, 5.9)
|
155
|
5.3 (5.1, 5.6)
|
|
Males‡
|
|
Vitamin D intake (ug/d)§
|
|
< 7.0
|
28
|
6.9 (5.6, 8.2)
|
92
|
5.8 (5.4, 6.2)
|
44
|
5.8 (5.2, 6.5)
|
19
|
5.9 (4.4, 7.5)
|
|
7.0–13.9
|
21
|
7.0 (5.4, 8.6)
|
103
|
6.1 (5.6, 6.6)
|
107
|
6.0 (5.6, 6.4)
|
66
|
6.1 (5.6, 6.7)
|
|
14.0–20.9
|
4
|
5.7 (4.4, 6.9)
|
33
|
5.6 (4.9, 6.4)
|
56
|
5.6 (5.0, 6.2)
|
50
|
6.1 (5.4, 6.8)
|
|
> 20.9
|
4
|
5.7 (1.2, 9.5)
|
68
|
5.6 (5.2, 6.0)
|
62
|
5.6 (4.5, 6.7)
|
71
|
5.2 (4.9, 5.6)†
|
|
Females‡
|
|
Vitamin D intake (ug/d)§
|
|
< 7.0
|
58
|
6.1 (5.6, 6.6)
|
138
|
6.0 (5.6, 6.4)
|
81
|
5.8 (5.4, 6.2)
|
34
|
5.6 (4.7, 6.5)
|
|
7.0–13.9
|
23
|
6.1 (5.3, 6.9)
|
122
|
5.8 (5.5, 6.1)
|
129
|
5.8 (5.4, 6,2)
|
53
|
5.8 (5.2, 6.4)
|
|
14.0–20.9
|
11
|
8.0 (4.7, 11.4)
|
52
|
6.0 (5.3, 6.6)
|
74
|
5.7 (5.3, 6.1)
|
54
|
5.4 (5.0, 5.9)#
|
|
> 20.9
|
12
|
5.7 (4.2, 7.2)
|
75
|
5.8 (5.3, 6.3)
|
89
|
5.3 (5.0, 5.7)
|
84
|
5.4 (5.0, 5.8)
|
- #P < 0.05. Linear trend for serum PTH across calcium intake groups without adjustments
- †P < 0.05. Linear trend for serum PTH across vitamin D intake groups without adjustments as well as with sex, age, BMI and month of blood sampling (using dummy variables) as covariates
- ‡ Subjects in the Tromsø study with valid food frequency questionnaires, serum 25(OH)D measurement, not been on a sunny vacation last 2 months, not taking solarium regularly, with valid serum PTH measurement, and with serum calcium < 2.51 mmol/L.
- § Including supplements
- The data are mean (95% CI). The P values are adjusted for multiple testing with a factor of 4
