Table 1. Descriptive statistics for all control variables that were entered in the statistical analysis.
| Variable | Value | Frequency | Percentage |
|---|---|---|---|
| Sex | Male | 43 | 47.3 |
| Female | 48 | 52.7 | |
| Age | ≤33 years | 48 | 52.7 |
| >33 years | 43 | 47.3 | |
| BMI | Underweight | 5 | 5.5 |
| Normal weight | 55 | 60.4 | |
| Pre-obese | 24 | 26.4 | |
| Obese | 7 | 7.7 | |
| Education | Certificate of secondary education (“Hauptschulabschluss”) | 1 | 1.1 |
| Secondary school level (“Mittlere Reife”) | 19 | 20.9 | |
| Graduation (“Ausbildung”) | 5 | 5.5 | |
| Vocational diploma (“Fachabitur”) | 10 | 11.0 | |
| General qualification for university entrance (“Abitur”) | 23 | 25.3 | |
| Bachelor degree | 9 | 9.9 | |
| Diploma or master degree | 17 | 18.7 | |
| PhD | 4 | 4.4 | |
| Other | 2 | 2.2 | |
| Missing | 1 | 1.1 | |
| Profession | Student | 17 | 18.7 |
| Full-time employee | 35 | 38.5 | |
| Graduation | 1 | 1.1 | |
| Part-time employee | 14 | 15.4 | |
| PhD student | 4 | 4.4 | |
| Retired | 3 | 3.3 | |
| Self-employed | 8 | 8.8 | |
| Unemployed | 8 | 8.8 | |
| Missing | 1 | 1.1 | |
| Smoking | No | 11 | 12.1 |
| Yes | 80 | 87.9 | |
| Caffeine | No | 14 | 15.4 |
| Yes | 28 | 30.8 | |
| Missing | 49 | 53.8 | |
| Alcohol | No | 61 | 67.0 |
| Yes | 22 | 24.2 | |
| Missing | 8 | 8.8 | |
| Oral contraceptives (women only) | No | 41 | 85.4 |
| Yes | 7 | 14.6 | |
| Activity level | Low | 17 | 18.7 |
| Moderate | 24 | 26.4 | |
| High | 48 | 52.7 | |
| Missing | 2 | 2.2 | |
| Chronic stress | Low stress | 47 | 51.6 |
| High stress | 44 | 48.4 | |
| SECPT performance | Winner | 71 | 78.0 |
| Loser | 20 | 22.0 |
Note:
Sample size was N = 91.