Table 1.
Group characteristics and moderating factors at three time points
| Participant characteristic | Ag status | Oct 14 n = 96 Ag− n = 46 Ag+ n = 50 | Feb 15 n = 87 Ag− n = 45 Ag+ n = 42 | Jun 15 n = 77 Ag− n = 43 Ag+ n = 34 | P |
|---|---|---|---|---|---|
| Age in years, mean (SD) | Negative | 15.41 (3.47) | 15.33 (3.30) | 16.28 (3.35) | 0.350a |
| Positive | 15.20 (3.38) | 14.98 (3.50) | 15.38 (3.68) | 0.879a | |
| Female, n = (%) | Negative | 26 (56.5%) | 27 (60.0%) | 28 (65.1%) | 0.707b |
| Positive | 27 (54.0%) | 23 (54.8%) | 22 (64.7%) | 0.579b | |
| Height in cm, mean (SD) | Negative | 152.55 (11.65) | 153.28 (11.34) | 154.10 (9.58) | 0.798a |
| Positive | 151.80 (12.56) | 151.56 (12.57) | 149.65 (12.07) | 0.712a | |
| Weight in kg, mean (SD) | Negative | 42.62 (10.16) | 44.05 (9.81) | 44.61 (9.30) | 0.612a |
| Positive | 42.27 (12.81) | 43.29 (12.98) | 40.36 (11.83) | 0.598a | |
| BMI, mean (SD) | Negative | 18.04 (2.79) | 18.50 (2.68) | 18.67 (2.78) | 0.531a |
| Positive | 18.04 (3.33) | 18.40 (3.36) | 17.57 (3.23) | 0.562a | |
| Underweight for age n = (%) | Negative | 6 (13.0%) | 6 (13.3%) | 3 (7.0%) | 0.567b |
| Positive | 7 (14.0%) | 5 (11.9%) | 7 (20.6%) | 0.554b | |
| Occupation, student n = (%) | Negative | 13 (28.3%) | 12 (26.7%) | 9 (20.9%) | 0.609b |
| Positive | 14 (28.0%) | 14 (33.3%) | 9 (26.4%) | 0.152b | |
| Menstruation ≥ 2 weeks n = (%) | Negative | 7 (26.9%) | 5 (18.5%) | 7 (25.0%) | 0.597b |
| Positive | 8 (16.0%) | 9 (21.4%) | 2 (5.9$) | 0.425b | |
| Hydration ≤ 60 min n = (%) | Negative | 12 (26.1%) | 19 (42.2%) | 26 (60.5%) | 0.016b |
| Positive | 13 (26.0%) | 15 (35.7%) | 20 (58.8%) | 0.009b |
Ag, antigen status; BMI, body mass index; SD, standard deviation.
a
One‐way ANOVA.
b
Pearson chi‐square.