Table 1

Characteristics of study participants

NMeanSD
Birth weight (kg)29433.430.53
Age (years)294366.12.8
Height (cm)2940167.99.1
Physical activity score294360.115.5
Fat mass (kg)*293525.21.4
Daily energy intake (cal)*294220771.3
Daily total vitamin D intake (μg)* 29424.381.9
NMedianIQR
Pack years smoked293210.0–22.0
Alcohol consumption (units per week)294240.4–12.0
Number of rooms for household use293465.0–6.0
Total NN%
Male2943155252.7
Female139147.3
COPD293752117.7
Smoker status
 Never2942136146.3
 Ex120941.1
 Current37212.6
Exposed to tobacco smoke in home36612.8
Social class
 I–IIINM2895119541.3
 IIIM–V170058.7
Father's social class at birth
 I–IIINM276044616.2
 IIIM–V231483.8
Age left education
 ≤14294354318.5
 ≥15240081.5
Home ownership status
 Owned/mortgaged2943235079.9
 Rented56719.3
 Other260.9
No. of cars for household use
 0294233011.2
 1162355.2
 283628.4
 3+1535.2
Dietary supplement use2942153652.2
Use of oral or inhaled steroids29432348
Paracetemol use29432839.6
  • * Geometric mean and SD.

  • Vitamin D intake from diet and supplements.