| | Variable | Total (n = 1022) | Testing set (n = 313) | Training set (n = 709) | Statistical magnitude | |
| | Gender, n (%) | | | | χ 2 = 0.120 | 0.729 | | Male | 635 (62.13) | 192 (61.34) | 443 (62.48) | | | | Female | 387 (37.87) | 121 (38.66) | 266 (37.52) | | | | Age, Mean ± SD | 61.92 ± 12.87 | 61.56 ± 12.67 | 62.08 ± 12.96 | t = −0.60 | 0.551 | | Race, n (%) | | | | χ 2 = 0.812 | 0.666 | | Non-Hispanic White | 699 (68.40) | 220 (70.29) | 479 (67.56) | | | | Non-Hispanic Black | 170 (16.63) | 50 (15.97) | 120 (16.93) | | | | Other race | 153 (14.97) | 43 (13.74) | 110 (15.51) | | | | Education level, n (%) | | | | Z = −0.148 | 0.882 | | Under 12th grade | 278 (27.20) | 82 (26.20) | 196 (27.64) | | | | High school grad/GED | 274 (26.81) | 91 (29.07) | 183 (25.81) | | | | Some college or above | 470 (45.99) | 140 (44.73) | 330 (46.54) | | | | Marital status, n (%) | | | | χ 2 = 1.228 | 0.268 | | Married | 536 (52.45) | 156 (49.84) | 380 (53.60) | | | | Others | 486 (47.55) | 157 (50.16) | 329 (46.40) | | | | Annual family income, n (%) | | | | χ 2 = 0.056 | 0.814 | | <20000$ | 318 (31.12) | 99 (31.63) | 219 (30.89) | | | | ≥20000$ | 704 (68.88) | 214 (68.37) | 490 (69.11) | | | | Smoking, n (%) | | | | χ 2 = 0.026 | 0.871 | | Yes | 823 (80.53) | 253 (80.83) | 570 (80.39) | | | | No | 199 (19.47) | 60 (19.17) | 139 (19.61) | | | | Overweight, n (%) | | | | χ 2 = 0.023 | 0.879 | | Yes | 385 (37.67) | 119 (38.02) | 266 (37.52) | | | | No | 637 (62.33) | 194 (61.98) | 443 (62.48) | | | | A history of blood transfusion, n (%) | | | | χ 2 = 0.758 | 0.384 | | Yes | 237 (23.19) | 78 (24.92) | 159 (22.43) | | | | No | 785 (76.81) | 235 (75.08) | 550 (77.57) | | | | A history of heart disease in close relatives, n (%) | | | | χ 2 = 0.369 | 0.544 | | Yes | 211 (20.65) | 61 (19.49) | 150 (21.16) | | | | No | 811 (79.35) | 252 (80.51) | 559 (78.84) | | | | WBC, Mean ± SD | 7.75 ± 2.25 | 7.77 ± 2.08 | 7.73 ± 2.32 | t = 0.26 | 0.798 | | MONO, Mean ± SD | 8.31 ± 2.52 | 8.19 ± 2.29 | 8.37 ± 2.62 | t = −1.12 | 0.261 | | NEUT, M (Q1, Q3) | 4.50(4.10,5.60) | 4.60(4.22,5.70) | 4.50(4.10,5.60) | Z = 1.110 | 0.267 | | PLT, Mean ± SD | 240.39 ± 65.65 | 242.15 ± 62.85 | 239.62 ± 66.88 | t = 0.57 | 0.569 | | LYM, M (Q1, Q3) | 2.00 (1.80,2.50) | 2.00 (1.80,2.40) | 2.00 (1.80,2.50) | Z = −0.607 | 0.544 | | NLR, M (Q1, Q3) | 2.26 (2.00,3.11) | 2.34 (2.12,3.21) | 2.24 (2.00,3.02) | Z = 1.246 | 0.213 | | PLR, M (Q1, Q3) | 118.27 (109.05,154.74) | 121.50 (112.27,157.50) | 116.43 (107.69,152.50) | Z = 1.220 | 0.222 | | CVD, n(%) | | | | χ 2 = 0.259 | 0.611 | | No | 752 (73.58) | 227 (72.52) | 525 (74.05) | | | | Yes | 270 (26.42) | 86 (27.48) | 184 (25.95) | | |
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COPD: chronic obstructive pulmonary disease, WBC: white blood cell, MONO: monocyte, NEUT: neutrophil, PLT: platelet, LYM: lymphocyte, NLR: neutrophil/lymphocyte ratio, PLR: platelet/lymphocyte ratio, CVD: cardiovascular disease, GED: general equivalent diploma or equivalent.
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