Table 8 Multiracial proportion estimates overall, by phase, multi-institutional status, tier assessment, masking, and year.
Frequency (%), studies | Total number of participants | Estimated proportion (95% CI) | P-value compared to reference category (*) | P-value compared to 2010 Census proportion (1.56%) | \({I}^{2}\)(%) | |
|---|---|---|---|---|---|---|
Multiracial | ||||||
Overall | – | – | 0.25% (0.21–0.31) | – | < 0.0001 | 83.9% |
Phase | ||||||
II* | 1094 (68.9%) | 103,813 | 0.25% (0.19–0.32) | – | < .0001 | 83.8% |
III | 495 (31.2%) | 220,155 | 0.26% (0.18–0.35) | 0.894 | < .0001 | |
Institution status | ||||||
Single* | 682 (42.9%) | 102,520 | 0.40% (0.30–0.51) | – | < .0001 | 83.5% |
Multi-institutional | 907 (57.1%) | 221,448 | 0.19% (0.14–0.24) | 0.0001 | < .0001 | |
Tier assessment | ||||||
1* | 824 (51.9%) | 57,943 | 0.25% (0.18–0.33) | – | < .0001 | 83.9% |
2 | 765 (48.1%) | 266,025 | 0.26% (0.20–0.33) | 0.855 | < .0001 | |
Masking | ||||||
No masking* | 341 (21.5%) | 55,000 | 0.18% (0.10–0.29) | – | < .0001 | 83.5% |
Single | 107 (6.73%) | 22,081 | 0.27% (0.11–0.51) | 0.571 | < .0001 | |
Double | 389 (24.5%) | 79,017 | 0.22% (0.14–0.32) | 0.593 | < .0001 | |
Triple | 287 (18.1%) | 72,527 | 0.37% (0.24–0.52) | 0.0248 | < .0001 | |
Quadruple | 465 (29.3%) | 95,343 | 0.27% (0.19–0.38) | 0.176 | < .0001 | |
Study start year | ||||||
2008* | 121 (7.61%) | 35,685 | 0.23% (0.09–0.42) | – | < .0001 | 83.1% |
2009 | 156 (9.82%) | 30,239 | 0.20% (0.08–0.35) | 0.756 | < .0001 | |
2010 | 134 (8.43%) | 45,381 | 0.24% (0.11–0.44) | 0.901 | < .0001 | |
2011 | 145 (9.13%) | 17,765 | 0.16% (0.05–0.31) | 0.491 | < .0001 | |
2012 | 159 (10.0%) | 29,668 | 0.36% (0.20–0.57) | 0.302 | < .0001 | |
2013 | 189 (11.9%) | 32,347 | 0.26% (0.13–0.43) | 0.512 | < .0001 | |
2014 | 169 (10.6%) | 25,349 | 0.29% (0.15–0.48) | 0.606 | < .0001 | |
2015 | 177 (11.1%) | 29,085 | 0.30% (0.16–0.49) | 0.555 | < .0001 | |
2016 | 150 (9.44%) | 41,432 | 0.26% (0.13–0.44) | 0.805 | < .0001 | |
2017 | 128 (8.06%) | 23,619 | 0.17% (0.05–0.34) | 0.570 | < .0001 | |
2018 | 47 (2.96%) | 10,243 | 0.60% (0.25–1.11) | 0.0772 | < .0001 | |
2019 | 14 (0.88%) | 3155 | 0.22% (0.00–1.04) | 0.980 | 0.0053 | |
