Table 1.
Baseline characteristics of participants
| Yogurt group (n = 479) | Control group (n = 482) | p value | |
|---|---|---|---|
| Age (years) | 39.3 (11.5) | 39.4 (11.4) | 0.91* |
| BMI (kg/m2) | 22.0 (3.5) | 21.8 (3.5) | 0.42* |
| Occupation | 0.62** | ||
| Nurse | 310 (64.7%) | 312 (64.7%) | |
| Care worker | 43 (9.0%) | 33 (6.9%) | |
| Physical therapist/occupational therapist | 36 (7.5%) | 40 (8.3%) | |
| Others | 90 (18.8%) | 97 (20.1%) | |
| Irregular shift workers | 220 (46.0%) | 228 (47.3%) | 0.67** |
| Living by herself | 118 (24.6%) | 120 (24.9%) | 0.93** |
| Current smokers | 47 (9.8%) | 43 (8.9%) | 0.64** |
Values are expressed as the mean. Standard deviation or percentage is indicated in parentheses
*Wilcoxon's rank-sum test
**Chi-squared test