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Table 1 Rate of adverse outcomes following transfusion with fresher or older blood, results from binary propensity score analyses

From: Use of propensity score methods to address adverse events associated with the storage time of blood in an obstetric population: a comparison of methods

  Crude rate (95 % CI) Matched rate (95 % CI) Stratified rate (95 % CI) Weighted rate (95 % CI) Regression rate (95 % CI)
Severe morbidity
 Fresher 4.02 (3.15, 5.12) 4.22 (3.14, 5.65) 3.94 (2.82, 4.84) 3.76 (2.92, 4.82) 3.9 (3.09, 4.72)
 Older 3.37 (2.54, 4.45) 3.05 (2.14, 4.30) 3.4 (1.89, 4.92) 2.98 (2.20, 4.02) 3.4 (2.72, 4.08)
Readmission/transfer
 Fresher 14.18 (12.53, 15.99) 14.54 (12.50, 16.84) 14.44 (12.75, 16.14) 14.88 (13.21, 16.72) 14.44 (12.76, 16.13)
 Older 14.61 (12.87, 16.54) 14.34 (12.32, 16.63) 14.67 (11.79, 17.56) 13.58 (11.88, 15.48) 14.67 (13.00, 16.33)