Table 1 Age-standardized characteristics of participants at blood collection according to quartiles of mtDNAcn in overall samples from HPFS
From: Association between plasma L-carnitine levels and mitochondrial DNA copy number
Overall (N = 538) | ||||
|---|---|---|---|---|
Characteristics | Q1 | Q2 | Q3 | Q4 |
Number of participants | 134 | 135 | 135 | 134 |
mtDNAcn, z score | -1.2 (0.4) | -0.3 (0.1) | 0.3 (0.1) | 1.1 (0.3) |
Age, years* | 67.1 (7.6) | 66.2 (7.7) | 64.3 (8.2) | 64.1 (8.6) |
Race, white, % | 97.1 | 93.8 | 88.4 | 96.6 |
Body mass index, kg/m2 | 26.1 (1.9) | 25.8 (2) | 26.4 (2.3) | 25.6 (2.1) |
Physical activity, MET-hours/week | 28.5 (16.4) | 30.7 (18.8) | 29.8 (20.2) | 33.1 (20.4) |
Smoking status | ||||
Never, % | 35.7 | 44.3 | 61.8 | 43 |
Past, % | 52.5 | 49.4 | 34.5 | 53.2 |
Current, % | 11.8 | 6.2 | 3.6 | 3.8 |
Alternative Healthy Eating Index | 47.3 (6.6) | 49.3 (8) | 51.4 (8.9) | 49.6 (7.5) |
Alcohol consumption, g/d | 15.1 (11.2) | 12.7 (11.1) | 10.8 (10.1) | 14 (11) |
History of diabetes | 6.2 | 4.9 | 1.2 | 2.4 |
History of cardiovascular diseases | 8.3 | 7.4 | 7.4 | 8.6 |
History of hypercholesterolemia | 38.7 | 38.1 | 41.8 | 39.7 |