Table 2.

Relative risk of venous thromboembolism according to activated partial thromboplastin time (APTT) ratio, using as cut-off value the fifth percentile of the distribution of values in controls

APTT ratio*
Patients N = 605
Controls N = 1290
Unadjusted odds ratio (95% CI)
Odds ratio†(95% CI)
Greater than or equal to 0.87   539   1227   1   1  
Less than 0.87
 		 66
 		 63
 		 2.4 (1.7-3.4)
 		 2.4 (1.7-3.6)
 
APTT ratio*
Patients N = 605
Controls N = 1290
Unadjusted odds ratio (95% CI)
Odds ratio†(95% CI)
Greater than or equal to 0.87   539   1227   1   1  
Less than 0.87
 		 66
 		 63
 		 2.4 (1.7-3.4)
 		 2.4 (1.7-3.6)
 
*

Test-to-reference coagulation time

†

Adjusted for age, sex, and the presence of inherited thrombophilia (antithrombin, protein C, and protein S deficiencies, factor V G1691A, and prothrombin G20210A gene mutations). CI indicates confidence interval

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