Table 4.
Binary logistic regression analysis output for the prediction of: (A) Anemia; (B) HMB; (C) Reported days off (n = 292).
| (A) | Unadjusted model | Adjusted model | ||||||
| Predictor | B (SE) | P | odds ratio | 95% CI for odds ratio (low, high) | B (SE) | P | odds ratio | 95% CI for odds ratio (low, high) |
| History of iron deficiency | 0.29 (0.39) | .46 | 1.33 | 0.62, 2.85 | ||||
| Previous blood donor | 0.49 (0.45) | .27 | 1.64 | 0.68, 3.92 | ||||
| Vegetarian | 0.6 (0.45) | .18 | 1.82 | 0.76, 4.4 | ||||
| Vegan | 0.21 (0.69) | .75 | 1.24 | 0.32, 4.76 | ||||
| HMB positive | 0.67 (0.39) | .09 | 1.96 | 0.9,4.24 | 0.80 (0.37) | .03 | 2.22 | 1.08, 4.57 |
| Childbirth | −0.4 (0.67) | .55 | 0.67 | 0.18, 2.49 | ||||
| Brain Fog | 0.088 (0.4) | .83 | 1.09 | 0.5, 2.4 | ||||
| Shortness of Breath | 0.38 (0.45) | .40 | 1.46 | 0.61, 3.5 | ||||
| Palpitations | −1.05∗ (0.47) | .03 | 0.35 | 0.14, 0.88 | −0.85 (0.43) | .047 | 0.426 | 0.18, 0.99 |
| Restless legs | 0.22 (0.41) | .58 | 1.25 | 0.56, 2.79 | ||||
| Hair Loss | 0.3 (0.4) | .45 | 1.35 | 0.62, 2.97 | ||||
| Pica | 0.76 (0.77) | .32 | 2.13 | 0.47, 9.59 | ||||
| Days lost | −0.38 (0.47) | .41 | 0.68 | 0.27, 1.7 | ||||
| Note: R^2 = 0.053 (Cox & Snell), .1 (Nagelkerke). Model X^2 (13) = 15.74, p = 0.263 | Note: R^2 = 0.027 (Cox & Snell), .051 (Nagelkerke). Model X^2 (2) = 7.97, P = .019. | |||||||
| Percentage correct = 87.6% (beginning block), 88.3% (main model) | Percentage correct = 87.6% (beginning block), 87.6% (main model). | |||||||
| (B) | Unadjusted model | |||
| Predictor | B (SE) | P | Odds ratio | 95% CI for odds ratio (low, high) |
| Brainfog | .484 (.260) | .063 | 1.623 | 0.974, 2.704 |
| Restless legs | .654∗ (.271) | .016 | 1.923 | 1.129, 3.274 |
| Pica | 2.52∗ (1.07) | .019 | 12.363 | 1.521, 100.497 |
| Days lost | .893∗ (.289) | .002 | 2.442 | 1.387, 4.301 |
| Note: R^2 = 0.117 (Cox & Snell), .16 (Nagelkerke). Model X^2 (4) = 36.12, P < .001 | ||||
| Percentage correct = 56.4% (beginning block), 65.3% (main model) | ||||
| (C) | Unadjusted model | |||
| Predictor | B (SE) | P | odds ratio | 95% CI for odds ratio (low, high) |
| History of iron deficiency | 0.83∗ (0.31) | .01 | 2.30 | 1.26, 4.20 |
| Previous blood donor | 0.27 (0.38) | .49 | 1.31 | 0.62, 2.77 |
| Vegetarian | 0.51 (0.38) | .18 | 1.67 | 0.79, 3.52 |
| Vegan | 0.97∗ (0.57) | .09 | 2.65 | 0.87, 8.08 |
| HMB positive | 0.83∗ (0.31) | .01 | 2.29 | 1.24, 4.21 |
| Childbirth | 0.47 (0.47) | .32 | 1.59 | 0.64, 3.99 |
| Brain Fog | 0.84∗ (0.33) | .01 | 2.31 | 1.22, 4.36 |
| Shortness of Breath | 0.31 (0.34) | .37 | 1.36 | 0.69, 2.67 |
| Palpitations | 0.99∗ (0.32) | .00 | 2.69 | 1.43, 5.05 |
| Restless legs | −0.27 (0.33) | .41 | 0.76 | 0.40, 1.46 |
| Hair Loss | 0.58∗ (0.32) | .07 | 1.79 | 0.96, 3.35 |
| Pica | −0.02∗ (0.71) | .97 | 0.98 | 0.24, 3.94 |
| Note: R^2 = 0.196 (Cox & Snell), .283 (Nagelkerke). Model X^2 (14) = 63.42, P < .001. | ||||
| Percentage correct = 72.5% (beginning block), 78.7% (main model). | ||||
CI = confidence interval, SE = standard error.
∗
=significant predictor (P < .05).