Table 3

Multivariable analysis of clinical and risk factors associated with DVT†

VariableOR (95% CI)P value
Pain/tenderness of the lower limb7.0 (2.4 to 20.3)≤0.001*
Calf asymmetry‡3.6 (1.0 to 12)0.042*
Entire limb swollen10 (4.1 to 24)≤0.001*
Unilateral limb pitting oedema7.6 (2.3 to 26)0.001*
Tenderness along line of femoral or popliteal veins0.70 (0.17 to 2.8)0.605
Dilated collateral superficial veins1.6 (0.20 to 11)0.666
Malignancy§5.2 (2.0 to 13)0.001*
Bedridden¶1.5 (0.65 to 3.7)0.328
  • *Statistically significant; p<0.0.05.

  • †Only factors with a p value <0.05 and an absolute frequency >5 were considered for multivariate analysis.

  • ‡Calf more than 3 cm different in circumference, 10 cm below tibial tuberosity.

  • §Malignancy present or previous, on treatment or palliation up to 6 months previously.

  • ¶Immobilisation (complete bed rest or inability to walk for >30 min per day) for >3 days.

  • DVT, deep vein thrombosis.