Table 2 Baseline characteristics of subjects according to availability of TBARS measure and the 15 selected predictors
Total (n = 4,129) | Measured TBARS (n = 2,116) | Non measured TBARS (n = 2,013) | P valuea | ||
|---|---|---|---|---|---|
No. of subjects (%) | Incomplete cases | Complete cases | Incomplete cases | Complete cases | |
Median [IQR] | 1,004 | 1,112 | 734 | 1,279 | |
Gender | <0.0001 | ||||
Male | 467 (46.5) | 538 (48.4) | 283 (38.6) | 515 (40.3) | |
Female | 537 (53.5) | 574 (51.6) | 451 (61.4) | 764 (59.7) | |
Age (years) | 50 (46 to 55) | 49 (46 to 54) | 48 (44 to 53) | 48 (44 to 53) | <0.0001 |
Intervention group | 0.54 | ||||
Placebo | 471 (46.9) | 545 (49.0) | 357 (48.6) | 593 (46.4) | |
Supplementation | 533 (53.1) | 567 (51.0) | 377 (51.4) | 686 (53.6) | |
Number of dietary records | 12 [10–13] | 12 [10–13] | 12 [10–13] | 12 [10–13] | 0.24 |
Energy intakeb (kcal/d) | 1,994 [1,664–2,395] | 2,017 [1,660–2,369] | 1,965 [1,635–2,326] | 1,988 [1,669–2,315] | 0.34 |
Alcohol intake at inclusion (log) (g/d) | 2.68 [0.00–3.38] | 2.68 [0.00–3.38] | 2.68 [0.00–3.09] | 2.01 [0.00–3.18] | 0.006 |
Missing | 140 | 0 | 138 | 0 | |
Smoking status at inclusion | 0.18 | ||||
Never smoker | 475 (50.9) | 549 (49.4) | 350 (52.1) | 665 (52.0) | |
Former smoker | 375 (40.2) | 424 (38.1) | 246 (36.6) | 475 (37.1) | |
Current smoker | 83 (8.9) | 139 (12.5) | 76 (11.3) | 139 (10.9) | |
Missing | 71 | 0 | 62 | 0 | |
Weight at inclusion (kg) | 66 [57–75] | 67 [58–77] | 64 [56–74] | 65 [57–74] | 0.004 |
Missing | 23 | 0 | 14 | 0 | |
Height at inclusion (cm) | 167 [161–173] | 168 [161–174] | 166 [160–172] | 166 [160–172] | <0.0001 |
Missing | 27 | 0 | 14 | 0 | |
Plasma selenium (μmol/L) | 1.08 [0.96–1.20] | 1.09 [0.98–1.20] | 1.09 [0.98–1.20] | 1.11 [1.00–1.23] | 0.0003 |
Missing | 92 | 0 | 69 | 0 | |
Plasma zinc (μmol/L) | 13.20 [12.10–14.30] | 13.30 [12.00–14.4] | 12.80 [11.70–14.00] | 13.10 [11.90–14.35] | <0.0001 |
Missing | 92 | 0 | 61 | 0 | |
Plasma α-tocopherol (μmol/L) (log) | 3.46 [3.31–3.60] | 3.41 [3.25–3.56] | 3.41 [3.27–3.57] | 3.41 [3.25–3.55] | <0.0001 |
Missing | 292 | 0 | 284 | 0 | |
Plasma β-carotene (μmol/L) (log) | −0.64 [−1.05- -0.21] | −0.71 [−1.17- -0.29] | −0.65 [−1.12- -0.21] | −0.66 [−1.11- -0.28] | 0.009 |
Missing | 292 | 0 | 284 | 0 | |
Retinol (μmol/L) | 2.31 [1.90-2.74] | 2.16 [1.76-2.55] | 2.27 [1.90-2.62] | 2.12 [1.78- 2.54] | <0.0001 |
Missing | 292 | 0 | 284 | 0 | |
Vitamin C (μmol/L) | 9.63 [7.77 -11.71] | 9.64 [7.44-11.63] | 10.18 [7.76-12.19] | 9.81 [7.33-12.04] | 0.13 |
Missing | 675 | 0 | 362 | 0 | |