Table 2 Distribution of potential confounders before and after matching
From: Targeted temperature management in cardiac arrest: survival evaluated by propensity score matching
Before matching | After matching | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Control (n = 153) | Treated (n = 183) | Control (n = 96) | Treated (n = 96) | |||||||
Count/ | Percenta/ | Count/ | Percenta/ | Count/ | Percenta/ | Count/ | Percenta/ | |||
[mean] | (SD) | [mean] | (SD) | P-value | [mean] | (SD) | [mean] | (SD) | P-value | |
Age | [64] | (20) | [59] | (16) | 0.01 | [63] | (18) | [61] | (17) | 0.63 |
Male Gender | 86 | 56% | 140 | 77% | <0.001 | 59 | 61% | 70 | 73% | 0.12 |
Shockable rhythm | <0.001 | 0.09 | ||||||||
No | 102 | 67% | 49 | 27% | 56 | 58% | 41 | 43% | ||
Yes | 41 | 27% | 132 | 72% | 38 | 40% | 53 | 55% | ||
(Missing) | 10 | 7% | 2 | 1% | 2 | 2% | 2 | 2% | ||
Witnessed CA | 111 | 73% | 164 | 90% | <0.001 | 76 | 79% | 80 | 83% | 0.58 |
Bystander CPR | 72 | 47% | 130 | 71% | <0.001 | 52 | 54% | 56 | 58% | 0.66 |
Time CA to professional CPR | [14.6] | (25.5) | [11.2] | (16.8) | 0.15 | [7.1] | (5.6) | [8.0] | (5.5) | 0.32 |
(Missing) | 12 | 8% | 6 | 3% | 0.11 | 6 | 6% | 6 | 6% | 1.00 |
Time CA to ROSC | [27.2] | (16.5) | [26.7] | (16.1) | 0.77 | [24.4] | (13.8) | [22.7] | (12.6) | 0.38 |
(Missing) | 9 | 6% | 16 | 9% | 0.43 | 6 | 6% | 8 | 8% | 0.78 |
Smoking | 0.001 | 0.44 | ||||||||
No | 32 | 21% | 39 | 21% | 23 | 24% | 18 | 19% | ||
Ex-smoker | 28 | 18% | 47 | 26% | 19 | 20% | 19 | 20% | ||
Smoker | 37 | 24% | 66 | 36% | 27 | 28% | 37 | 39% | ||
(Missing) | 56 | 37% | 31 | 17% | 27 | 28% | 22 | 23% | ||
Diabetes Mellitus | <0.001 | 0.69 | ||||||||
No | 97 | 63% | 155 | 85% | 73 | 76% | 79 | 82% | ||
Type 1 | 5 | 3% | 5 | 3% | 4 | 4% | 2 | 2% | ||
Type 2 | 20 | 13% | 20 | 11% | 16 | 17% | 12 | 12% | ||
(Missing) | 31 | 20% | 3 | 2% | 3 | 3% | 3 | 3% | ||
Hypertension | <0.001 | 0.83 | ||||||||
No | 78 | 51% | 116 | 63% | 56 | 58% | 57 | 59% | ||
Yes | 48 | 31% | 62 | 34% | 33 | 34% | 34 | 35% | ||
(Missing) | 27 | 18% | 5 | 3% | 7 | 7% | 5 | 5% | ||
Previous myocardial infarction | 42 | 27% | 52 | 28% | 0.94 | 30 | 31% | 29 | 30% | 1.00 |