Table 4. Physical Activity Level and Metabolic Status by Quartiles of NK Cell Activity.
| Variables | NK cell activity Quartile 1 (<673 pg/mL) | NK cell activity Quartile 2 (673–1547 pg/mL) | NK cell activity Quartile 3 (1548–2726 pg/mL) | NK cell activity Quartile 4 (>2726 pg/mL) | p value* |
|---|---|---|---|---|---|
| Physical activity level | |||||
| Inactive | 1278 (42.5) | 1228 (40.9) | 1168 (38.9) | 1133 (37.7) | <0.001 |
| Minimally active | 1418 (47.2) | 1498 (49.9) | 1490 (49.6) | 1534 (51.1) | |
| HEPA | 308 (10.3) | 277 (9.2) | 346 (11.5) | 336 (11.2) | |
| Body mass index (kg/m2)† | |||||
| <18.5 (underweight) | 196 (6.5) | 140 (4.7) | 116 (3.9) | 76 (2.5) | <0.001 |
| 18.5–27.5 (normal or overweight) | 2479 (82.6) | 2542 (84.8) | 2539 (84.6) | 2574 (85.7) | |
| ≥27.5 (obese) | 327 (10.9) | 316 (10.5) | 347 (11.6) | 353 (11.8) | |
| Large waist circumference‡,∥ | 742 (24.7) | 697 (23.2) | 718 (23.9) | 732 (24.4) | 0.924 |
| Hemoglobin A1c ≥ 6.5%§ | 84 (2.8) | 57 (1.9) | 57 (1.9) | 51 (1.7) | 0.005 |
| Blood pressure ≥130/85 mm Hg§ | 323 (10.8) | 278 (9.3) | 301 (10.0) | 277 (9.2) | 0.116 |
| Triglyceride ≥150 mg/dL§ | 584 (19.5) | 615 (20.5) | 626 (20.9) | 615 (20.5) | 0.290 |
| Low HDL-C§,¶ | 360 (12.0) | 336 (11.2) | 317 (10.6) | 295 (9.8) | 0.005 |
NK, natural killer; HEPA, health-enhancing physically active; HDL-C, high-density lipoprotein cholesterol; OR, odds ratio; CI, confidence interval.
Data are presented as number (%).
*Linear-by-linear association tests were used, †Missing values for 9 individuals, ‡Missing values for 6 individuals, §Missing values for 12 individuals, ∥>90 cm in men, >80 cm in women, ¶<40 mg/dL in men, <50 mg/dL in women.