Table 2.
Demographic factors between included and excluded participants.
| Demographic factor | Included | Excludeda | P valuec |
|---|---|---|---|
| (N = 10,123)b | (N = 76)b | ||
| Age (years), mean | 58.83 (58.27, 59.39) | 62.36 (58.01, 66.71) | 0.117 |
| Sex, % | 0.518 | ||
| Men | 47.26 (46.11, 48.42) | 41.15 (23.5, 61.42) | |
| Women | 52.74 (51.58, 53.89) | 58.85 (38.58, 76.50) | |
| Race/ethnicity, % | 0.718 | ||
| White | 67.49 (63.22, 71.48) | 71.71 (56.2, 83.35) | |
| Black | 10.62 (8.5, 13.19) | 7.19 (3.43, 14.45) | |
| Mexican American | 6.65 (5.11, 8.60) | 5.90 (2.44, 13.59) | |
| Other | 15.25 (13.12, 17.65) | 15.21 (7.76, 27.65) | |
| History of arthritis, % | 0.032 | ||
| Yes | 38.81 (36.81, 40.81) | 42.39 (26.34, 58.43) | |
| No | 60.98 (58.98, 62.97) | 55.45 (39.11, 71.79) | |
| Unknownd | 0.22 (0.13, 0.30) | 2.16 (− 2.06, 6.39) | |
| History of congestive heart failure, % | 0.029 | ||
| Yes | 3.83 (3.28, 4.38) | 8.31 (− 0.01, 16.63) | |
| No | 95.91 (95.34, 96.48) | 89.82 (80.90, 98.75) | |
| Unknownd | 0.26 (0.12, 0.40) | 1.87 (− 1.29, 5.02) | |
| History of coronary heart disease, % | 0.008 | ||
| Yes | 5.94 (4.86, 7.03) | 12.96 (2.26, 23.66) | |
| No | 93.76 (92.66, 94.86) | 84.61 (73.16, 96.06) | |
| Unknownd | 0.30 (0.17, 0.42) | 2.43 (− 1.83, 6.70) | |
| History of angina/angina pectoris, % | < 0.001 | ||
| Yes | 3.17 (2.69, 3.65) | 0.68 (− 0.26, 1.62) | |
| No | 96.56 (96.05, 97.07) | 91.28 (86.43, 96.12) | |
| Unknownd | 0.27 (0.19, 0.35) | 8.04 (3.33, 12.75) | |
| History of heart attack, % | < 0.001 | ||
| Yes | 5.38 (4.56, 6.19) | 3.74 (− 1.89, 9.38) | |
| No | 94.49 (93.68, 95.31) | 90.03 (80.85, 99.20) | |
| Unknownd | 0.13 (0.04, 0.22) | 6.23 (− 1.18, 13.64) | |
| History of stroke, % | < 0.001 | ||
| Yes | 4.99 (4.47, 5.50) | 4.31 (− 0.52, 9.15) | |
| No | 94.90 (94.36, 95.43) | 90.57 (86.08, 95.06) | |
| Unknownd | 0.12 (0.04, 0.19) | 5.12 (− 2.08, 12.32) | |
| History of cancer, % | < 0.001 | ||
| Yes | 16.45 (15.49, 17.40) | 23.47 (12.00, 34.93) | |
| No | 83.50 (82.54, 84.47) | 74.37 (62.42, 86.32) | |
| Unknownd | 0.05 (− 0.02, 0.12) | 2.16 (− 2.06, 6.39) |
% Weighted percentage.
aSubject aged 40 and older without definitive answer to the question on metal implants (refused to answer or answered “don’t know”) or with missing data on metal implants.
bUnweighted sample size.
cP value determined by survey-weighted linear regression (for continuous variables) or survey-weighted Chi-square test (for categorical variables).
dParticipants who (i) refused to answer the question, (ii) answered “don’t know.” to the question, or (iii) with missing data.