Table 2.
URTI data for all subjects and subgroups during 12 weeks supplementationa.
| URTI variable | Placebo (N = 317) | Q-500 (N = 315) | Q-1000 (N = 315) | 1-Way ANOVA F-probability |
|---|---|---|---|---|
| All subjects | ||||
| URTI, # days | 8.4 ± 0.5 | 8.5 ± 0.5 | 8.5 ± 0.5 | 0.982 |
| URTI severity | 19.3 ± 1.3 | 18.3 ± 1.2 | 19.8 ± 1.3 | 0.670 |
| URTI symptom | 108 ± 8.0 | 108 ± 8.3 | 111 ± 8.0 | 0.946 |
| Gender | ||||
| Males | (N = 117) | (N = 137) | (N = 131) | |
| URTI, # days | 7.1 ± 0.9 | 7.0 ± 8.1 | 7.7 ± 0.8 | 0.794 |
| URTI severity | 17.2 ± 2.1 | 14.8 ± 1.6 | 17.1 ± 1.7 | 0.537 |
| URTI symptom | 92.0 ± 11.5 | 77.5 ± 10.2 | 98.8 ± 12.0 | 0.375 |
| Females | (N = 200) | (N = 178) | (N = 184) | |
| URTI, # days | 9.2 ± 0.7 | 9.5 ± 0.8 | 9.2 ± 0.7 | 0.930 |
| URTI severity | 20.6 ± 1.6 | 20.8 ± 1.7 | 21.8 ± 1.8 | 0.873 |
| URTI symptom | 118 ± 10.7 | 129 ± 12.0 | 120 ± 10.7 | 0.753 |
| Age (years) | ||||
| <40 | (N = 107) | (N = 103) | (N = 115) | |
| URTI, # days | 8.6 ± 0.9 | 10.3 ± 1.0 | 11.1 ± 0.9 | 0.129 |
| URTI severity | 20.6 ± 2.2 | 21.2 ± 2.0 | 26.2 ± 2.2 | 0.124 |
| URTI symptom | 123 ± 13.2 | 112 ± 12.2 | 147 ± 14.0 | 0.165 |
| 40–59 | (N = 133) | (N = 130) | (N = 140) | |
| URTI, # days | 9.0 ± 0.9 | 9.1 ± 0.8 | 7.7 ± 0.7 | 0.398 |
| URTI severity | 21.1 ± 2.1 | 21.1 ± 2.1 | 18.4 ± 1.8 | 0.544 |
| URTI symptom | 113 ± 13.4 | 129 ± 14.6 | 105 ± 11.8 | 0.427 |
| 60–85 | (N = 77) | (N = 82) | (N = 60) | |
| URTI, # days | 7.2 ± 1.1 | 5.2 ± 0.9 | 5.5 ± 1.1 | 0.303 |
| URTI severity | 14.5 ± 2.2 | 10.2 ± 1.9 | 10.9 ± 2.5 | 0.299 |
| URTI symptom | 78.5 ± 14.4 | 67.7 ± 14.8 | 57.4 ± 14.2 | 0.617 |
| BMI (kg/m2) | ||||
| <25 | (N = 143) | (N = 149) | (N = 137) | |
| URTI, # days | 8.6 ± 0.8 | 8.7 ± 0.8 | 9.6 ± 0.8 | 0.617 |
| URTI severity | 20.2 ± 1.9 | 18.2 ± 1.7 | 20.3 ± 1.8 | 0.639 |
| URTI symptom | 114 ± 11.7 | 106 ± 10.8 | 109 ± 11.4 | 0.873 |
| 25–29.9 | (N = 90) | (N = 89) | (N = 104) | |
| URTI, # days | 8.5 ± 1.1 | 8.3 ± 1.1 | 7.3 ± 0.8 | 0.615 |
| URTI severity | 20.7 ± 2.7 | 17.7 ± 2.3 | 18.2 ± 2.1 | 0.636 |
| URTI symptom | 113 ± 16.9 | 95.2 ± 14.8 | 108 ± 14.1 | 0.713 |
| ≥30 | (N = 84) | (N = 77) | (N = 74) | |
| URTI, # days | 8.0 ± 0.9 | 8.3 ± 1.0 | 8.5 ± 1.1 | 0.939 |
| URTI severity | 16.3 ± 1.9 | 19.1 ± 2.7 | 21.3 ± 3.0 | 0.391 |
| URTI symptom | 93.8 ± 13.8 | 126 ± 20.4 | 118 ± 18.1 | 0.381 |
a
Data are presented as mean ± SEM.