Table 1.
Demographic summary about the cohort.
| All | No Breakthrough Infection | With Breakthrough Infection | p | |
|---|---|---|---|---|
| n | 22,204 | 20,695 | 1509 | |
| Female (%) | 14,149 (63.7%) | 13,263 (64.1%) | 886 (58.7%) | <0.0001 |
| Age, median (IQR) | 46 (25) | 47 (25) | 45 (22) | 0.0008 |
| Region | <0.0001 | |||
| Northeast | 9132 (41.1%) | 8677 (41.9%) | 455 (30.1%) | |
| South | 8034 (36.2%) | 7433 (35.9%) | 601 (39.8%) | |
| Midwest | 1205 (5.4%) | 1119 (5.4%) | 86 (5.7%) | |
| West | 3794 (17.1%) | 3430 (16.6%) | 364 (24.1%) | |
| Unknown | 39 (0.2%) | 36 (0.2%) | 3 (0.2%) | |
| Previous infection (%) | 2048 (9.2%) | 1973 (9.5%) | 75 (5.0%) | <0.001 |
| Ab Semi-quant Result (U/mL- BAU), median (IQR) | ||||
| With previous infection | 229 (556) | 232 (566) | 53 (145) | <0.0001 |
| Without previous infection | 149 (626) | 171 (668) | 0 (67) | <0.0001 |
| Days between Ab Semi-quant and follow-up PCR, median (IQR) | 52 (86) | 52 (85) | 42 (6) | <0.0001 |
| Number of follow-up PCR tests after Semi-quant, median (IQR) | 1 (1) | 1 (1) | 1 (1) | 0.0033 |
| Number of Semi-quant per patient, median (IQR) | 1 (0) | 1 (0) | 1 (0) | <0.0001 |
| COVID-19 Positivity Rate in Patient's Zip at Time of PCR Test, median (IQR) | 6.5% (7%) | 6.4% (7%) | 8.9% (9%) | <0.0001 |