Table 1

Baseline characteristics of 5765 men aged 35–64 from the Collaborative study according to number of siblings. Values are age adjusted means or percentages

01–23–45–67+p trend*
*Using siblings as a continuous variable. †Not age adjusted.
Number of men48920431535915783
Age† (y)46.447.148.649.749.90.0001
% adult social class I and II48.645.628.217.712.30.0001
% childhood social class I and II19.921.310.
% upwardly socially mobile58.258.452.
% downwardly socially mobile14.113.316.420.720.70.0001
% regular car drivers63.859.648.743.739.30.0001
% deprivation category 5–733.637.952.962.061.50.0001
% left education ≤14 years30.035.157.366.474.30.0001
% angina4.
% ECG ischaemia6.
% MRC bronchitis0.
Height (cm)174.2174.0172.7171.5170.70.0001
Body mass index (kg/m2)25.1825.1125.1525.2425.260.28
% obese (BMI≥30 kg/m2)
Adjusted FEV1 (%)96.596.294.591.690.50.0001
Adjusted FVC (%)97.898.097.195.494.30.0001
Cholesterol (mmol/l)6.05.995.855.785.730.0001
Systolic blood pressure (mm Hg)133.6133.6133.6134.8134.80.030
Diastolic blood pressure (mm Hg)83.783.883.684.284.30.14
% never smoked19.820.316.414.014.10.0001
% current cigarette smoker52.449.657.
Age started smoking (current) (y)19.118.717.817.517.60.0001
Age started smoking (ex) (y)18.318.017.717.117.80.028
Alcohol consumed per week (units)9.59.613.