Table 3. Importance of body mass index and absolute body weight for the relationship between oral vitamin D supplementation and serum 25(OH)D.
| Categorical BMI and absolute weight | Continuous BMI and absolute weight | |||||||||||
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 | |||||||
| BMI | Weight | combined | BMI | Weight | Combined | |||||||
| β (95%CI) | p-value | β (95%CI) | p-value | β (95%CI) | p-value | β (95%CI) | p-value | β (95%CI) | p-value | β (95%CI) | p-value | |
| BMI (continuous) | −1.5(−1.6, −1.4) | <.001 | −1.9(−2.2, −1.7) | <.001 | ||||||||
| Absolute weight (continuous) | −0.4(−0.5, −0.4) | <.001 | 0.1(0.1,0.2) | <.001 | ||||||||
| BMI category | ||||||||||||
| Underweight | 1.1(−3.4,5.7) | 0.623 | 0.7(−3.9,5.2) | 0.774 | ||||||||
| Normal weight | Ref. | Ref. | ||||||||||
| Overweight | −8.0(−9.3, −6.7) | <.001 | −7.4(−8.9, −6.0) | <.001 | ||||||||
| Obesity | −19.8(−21.1, −18.4) | <.001 | −18.8(−20.9, −16.8) | <.001 | ||||||||
| Absolute weight category | ||||||||||||
| <60 kg | 8.9(7.1,10.7) | <.001 | 3.8(1.9,5.7) | <.001 | ||||||||
| 60 kg to 80 kg | Ref. | Ref. | ||||||||||
| 80.1 to 100 kg | −6.7(−7.9, −5.4) | <.001 | 1.0(−0.6,2.5) | 0.223 | ||||||||
| >100 kg | −14.8(−16.4, −3.1) | <.001 | −0.7(−3.0,1.6) | 0.561 | ||||||||
| AIC | 213710.6 | 213990.2 | 213602.0 | 213852.0 | ||||||||
Footnote: β: β-coefficient; 95% CI: 95% confidence Interval; ref: reference category; AIC: Akaike Information Criteria; All the estimates are adjusted for age, gender, season and vitamin D supplementation; AIC values are based on models fitted with observations for which both BMI and absolute body weight were not missing.