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Table 2 Rate of adverse outcomes following transfusion with fresher or older blood, results from ordinal 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
 Freshest 4.23 (2.99, 5.92) 3.53 (2.70, 4.61) 3.74 (1.27, 6.2) 4.92 (3.57, 6.75) 3.6 (2.59, 4.92)
 2nd quartile 3.83 (2.69, 5.41)   3.9 (2.44, 5.37) 3.81 (2.64, 5.44) 3.4 (2.6, 4.09)
 3rd quartile 2.98 (1.97, 4.46)   3.05 (1.84, 4.25) 2.93 (1.90, 4.45) 3.53 (2.82, 4.46)
 Oldest 3.83 (2.58, 5.61) 3.60 (2.76, 4.69) 3.42 (2.01, 4.82) 3.06 (1.95, 4.74) 4.2 (2.76, 6.15)
Readmission/transfer
 Freshest 14.27 (11.95, 16.95) 14.54 (12.83, 16.43) 14.94 (10.01, 19.87) 14.84 (12.44, 17.59) 13.37 (11.35, 15.92)
 2nd quartile 14.09 (11.86, 16.67)   14.11 (11.37, 16.84) 13.66 (11.38, 16.31) 13.65 (13.12, 16.05)
 3rd quartile 14.14 (11.85, 16.78)   14.17 (11.75, 16.6) 13.36 (11.07, 16.04) 13.3 (12.68, 15.74)
 Oldest 15.16 (12.61, 18.12) 14.47 (12.76, 16.36) 14.96 (12.18, 17.75) 14.51 (11.97, 17.47) 12.97 (10.92, 15.75)