Table 3 American Indian and Alaska Native 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 (1.10%) | \({I}^{2}\)(%) | |
|---|---|---|---|---|---|---|
American Indian and Alaska Native | ||||||
Overall | – | – | 0.19% (0.15–0.23) | – | < 0.0001 | 78.5% |
Phase | ||||||
II* | 1094 (68.9%) | 103,813 | 0.13% (0.10–0.18) | – | < .0001 | 78.2% |
III | 495 (31.2%) | 220,155 | 0.30% (0.23–0.38) | < .0001 | < .0001 | |
Institution status | ||||||
Single* | 682 (42.9%) | 102,520 | 0.09% (0.05–0.14) | – | < .0001 | 77.9% |
Multi-institutional | 907 (57.1%) | 221,448 | 0.26% (0.21–0.31) | < .0001 | < .0001 | |
Tier assessment | ||||||
1* | 824 (51.9%) | 57,943 | 0.09% (0.05–0.13) | – | < .0001 | 78.0% |
2 | 765 (48.1%) | 266,025 | 0.29% (0.23–0.35) | < .0001 | < .0001 | |
Masking | ||||||
No masking* | 341 (21.5%) | 55,000 | 0.20% (0.12–0.29) | – | < .0001 | 78.0% |
Single | 107 (6.73%) | 22,081 | 0.13% (0.03–0.27) | 0.357 | < .0001 | |
Double | 389 (24.5%) | 79,017 | 0.17% (0.11–0.25) | 0.645 | < .0001 | |
Triple | 287 (18.1%) | 72,527 | 0.22% (0.13–0.32) | 0.746 | < .0001 | |
Quadruple | 465 (29.3%) | 95,343 | 0.20% (0.14–0.28) | 0.981 | < .0001 | |
Study start year | ||||||
2008* | 121 (7.61%) | 35,685 | 0.13% (0.04–0.26) | – | < .0001 | 77.5% |
2009 | 156 (9.82%) | 30,239 | 0.27% (0.15–0.43) | 0.135 | < .0001 | |
2010 | 134 (8.43%) | 45,381 | 0.22% (0.10–0.38) | 0.337 | < .0001 | |
2011 | 145 (9.13%) | 17,765 | 0.14% (0.05–0.27) | 0.891 | < .0001 | |
2012 | 159 (10.0%) | 29,668 | 0.24% (0.12–0.39) | 0.219 | < .0001 | |
2013 | 189 (11.9%) | 32,347 | 0.11% (0.04–0.21) | 0.639 | < .0001 | |
2014 | 169 (10.6%) | 25,349 | 0.17% (0.08–0.30) | 0.616 | < .0001 | |
2015 | 177 (11.1%) | 29,085 | 0.31% (0.18–0.48) | 0.0525 | < .0001 | |
2016 | 150 (9.44%) | 41,432 | 0.19% (0.09–0.32) | 0.490 | < .0001 | |
2017 | 128 (8.06%) | 23,619 | 0.14% (0.05–0.29) | 0.868 | < .0001 | |
2018 | 47 (2.96%) | 10,243 | 0.20% (0.04–0.49) | 0.545 | < .0001 | |
2019 | 14 (0.88%) | 3155 | 0.20% (0.00–0.87) | 0.737 | 0.0156 | |
