Table 2 Comparison of characteristics between matched and unmatched patients using strategy 1, and between unmatched patients using all 4 strategies
From: Linkage of Australian national registry data using a statistical linkage key
Strategy 1 | Matched patients (n = 1242) | Unmatched patients (n = 41) | p-value |
|---|---|---|---|
Age (mean, sd) | 63.5 (12.7) | 53.6 (15.1) |  < 0.001a |
Male sex (%, n) | 77.3 (960) | 80.5 (33) | 0.63e |
Risk of death % (median, IQR) | 1.08 (0.67–2.10) | 7.50 (1.33–14.5) |  < 0.001c |
Urgent/emergent procedure (%, n) | 22.0 (273) | 58.5 (24) |  < 0.001e |
Procedure type (%, n) | |||
CABG | 56.6 (703) | 26.8 (11) |  < 0.001e |
Valve repair/replacement | 15.1 (187) | 17.1 (7) | |
Combined CABG/Valve | 7.49 (93) | 4.9 (2) | |
Other | 20.1 (259) | 51.2 (21) | |
Unmatched patients: | Strategy 1 (n = 41) | Strategy 2 (n = 132) | Strategy 3 (n = 72) | Strategy 4 (n = 81) | p-value |
|---|---|---|---|---|---|
Age (mean, sd) | 53.6 (15.1) | 59.7 (14.7) | 57.2 (15.7) | 57.7 (16.2) | 0.15b |
Male sex (%, n) | 80.5 (33) | 80.3 (106) | 81.9 (59) | 80.3 (65) | 0.99e |
Risk of death % (median, IQR) | 7.50 (1.33–14.5) | 2.36 (1.2–7.6) | 4.26 (1.29–13.2) | 1.62 (0.82–8.78) | 0.02d |
Urgent/emergent procedure (%, n) | 58.5 (24) | 43.2 (57) | 55.6 (40) | 35.8 (29) | 0.02e |
Procedure type (%, n) | |||||
CABG | 26.8 (11) | 29.6 (39) | 29.2 (21) | 39.5 (32) | 0.76e |
Valve repair/replacement | 17.1 (7) | 19.7 (26) | 16.7 (12) | 13.6 (11) | |
Combined CABG/Valve | 4.9 (2) | 5.3 (7) | 5.6 (4) | 8.6 (7) | |
Other | 51.2 (21) | 45.5 (60) | 48.6 (35) | 38.3 (31) | |