Table 1.
Baseline characteristics of pediatric SOT and non-SOT groups before and after propensity score matching
| Variable |
Before Matching | After Matching | ||||
|---|---|---|---|---|---|---|
| Pediatric SOT group | Non-SOT group | SMD | Pediatric SOT group | Non-SOT group | SMD | |
| N = 206 | N = 20,600 | N = 205 | N = 803 | |||
| Sex | -0.121 | −0.005 | ||||
| Male | 98 (47.6) | 11039 (53.6) | 98 (47.8) | 386 (48.1) | ||
| Female | 108 (52.4) | 9561 (46.4) | 107 (52.2) | 417 (51.9) | ||
| Age (years), mean (SD) | 10.65 (3.7) | 9.54 (4.4) | 0.273 | 10.66 (3.7) | 10.69 (3.7) | −0.008 |
| Age (years), median (IQR) | 11 (8–14) | 10 (6–13) | 11 (8–14) | 11 (8–14) | ||
| 0–4 y | 12 (5.8) | 3124 (15.2) | 12 (5.9) | 48 (6.0) | ||
| 5–11 y | 105 (51.0) | 10236 (49.7) | 104 (50.7) | 402 (50.1) | ||
| 12–17 y | 89 (43.2) | 7240 (35.2) | 89 (43.4) | 353 (44.0) | ||
| Type of SOT | 0.716 | 0.707 | ||||
| Liver Transplantation | 149 (72.3) | 148 (72.2) | ||||
| Kidney Transplantation | 41 (19.9) | 41 (20.0) | ||||
| Heart Transplantation | 15 (7.3) | 15 (7.3) | ||||
| Lung Transplantation | 1 (0.5) | 1 (0.5) | ||||
| COVID-19 Vaccination (dose) | 0.46 (0.9) | 0.45 (0.8) | 0.011 | 0.46 (0.9) | 0.56 (0.9) | −0.110 |
| 0 | 158 (76.7) | 15906 (77.2) | 0.025 | 157 (76.6) | 576 (71.7) | 0.119 |
| 1 | 3 (1.5) | 250 (1.2) | 3 (1.5) | 11 (1.4) | ||
| 2 | 43 (20.9) | 4269 (20.7) | 43 (21.0) | 209 (26.0) | ||
| 3 | 2 (1.0) | 175 (0.9) | 2 (1.0) | 7 (0.9) | ||
| Comorbidities | ||||||
| PCI, mean score (SD) | 4.45 (3.3) | 1.40 (1.52) | 1.188 | 4.39 (3.2) | 3.92 (2.7) | 0.157 |
| PCI, median score (IQR) | 4 (2–6) | 1 (0–2) | 4 (2–6) | 4 (2–5) | ||
| PCI ≥ 5 | 91 (44.2) | 765 (3.7) | 1.077 | 90 (43.9) | 320 (39.9) | 0.082 |
| Timing of SARS-CoV-2 Infection | −0.008 | −0.010 | ||||
| Before Omicron-predominant | 7 (3.4) | 669 (3.3) | 7 (3.4) | 26 (3.2) | ||
| Omicron-predominant | 199 (96.6) | 19931 (96.8) | 198 (96.6) | 777 (96.8) | ||
Numbers indicate the number of cases and parentheses indicate (%). The notation for continuous variables is described for each variable item.
SOT, solid organ transplantation; SMD, standardized mean difference; SD, standard deviation; IQR, interquartile range; PCI, pediatric comorbidity index; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.