Table 3

Mean lung function and prevalence of chronic obstructive pulmonary disease by fifths of total vitamin D intake and serum 25(OH)D concentrations

Range of vitamin D (μg)FEV1 (l)FVC (l)FEV1/FVC ratioCOPD
NMeanSDNMeanSDNMeanSDTotal NN%
Fifths of total vitamin D intake:
1 (lowest)0.54–2.595892.350.695883.330.935880.7060.0958813322.6
22.59–3.425882.420.675863.400.935860.7130.0958610417.7
33.42–5.215892.470.685893.460.935890.7150.0858911319.2
45.22–7.635882.440.675863.410.925860.7190.095869816.7
5 (highest)7.64–59.55882.500.655873.450.905870.7280.075877312.4
Range of vitamin D (nmol/l)FEV1 (l)FVC (l)FEV1/FVC ratioCOPD
NMeanSDNMeanSDNMeanSDTotal NN%
Fifths of serum 25(OH)D concentration:
1 (lowest)11.4–27.42412.270.622403.130.832400.7260.092404117.1
227.5–38.22392.360.652393.260.872390.7280.082393715.5
338.3–48.02442.380.672443.310.902440.7210.092444116.8
448.1–62.82342.460.712333.430.962330.7170.082335021.5
5 (highest)62.9–336.52392.500.692393.520.922390.7120.092394920.5
  • FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; 25(OH)D, 25 hydroxy vitamin D.