Table 1.
Sample characterization.
| Full sample | Women | Men | Statistics | |
|---|---|---|---|---|
| (A) Measured during screening | ||||
| Age | 28.22 ± 1.00 | 28.53 ± 1.71 | 27.91 ± 1.06 | t = 0.31, p = .757 |
| Body mass index | 22.79 ± 0.33 | 21.92 ± 0.41 | 23.66 ± 0.47 | t = 2.80, p = .007 |
| Gastrointestinal symptoms | 2.70 ± 0.36 | 3.13 ± 0.55 | 2.28 ± 0.46 | t = 1.18, p = .241 |
| HADS anxiety | 3.70 ± 0.32 | 4.16 ± 0.48 | 3.25 ± 0.42 | t = 1.44, p = .156 |
| HADS depression | 1.76 ± 0.28 | 1.29 ± 0.26 | 2.22 ± 0.48 | t = 1.68, p = .096 |
| (B) Measured on study day | ||||
| STAI Trait | 35.67 ± 0.89 | 36.75 ± 1.35 | 34.59 ± 1.16 | t = 1.21, p = .230 |
| PANAS positive | 3.25 ± 0.08 | 3.27 ± 0.12 | 3.24 ± 0.11 | t = 0.15, p = .885 |
| PANAS negative | 1.39 ± 0.06 | 1.41 ± 0.09 | 1.37 ± 0.08 | t = 0.37, p = .715 |
| PRSS catastrophizing | 0.80 ± 0.10 | 0.77 ± 0.17 | 0.83 ± 0.12 | t = 0.31, p = .762 |
| PRSS coping | 3.54 ± 0.10 | 3.57 ± 0.14 | 3.52 ± 0.15 | t = 0.24, p = .811 |
| TMT version A | 26.30 ± 1.03 | 26.59 ± 1.60 | 26.00 ± 1.33 | t = 0.29, p = .776 |
| TMT version B | 53.70 ± 2.36 | 54.72 ± 2.34 | 52.69 ± 4.13 | t = 0.43, p = .670 |
| SCWT word reading | 30.65 ± 0.64 | 30.97 ± 1.09 | 30.34 ± 0.69 | t = 0.49, p = .628 |
| SCWT color naming | 47.29 ± 1.10 | 48.32 ± 1.72 | 46.28 ± 1.39 | t = 0.93, p = .358 |
| SCWT color-word naming | 69.25 ± 1.66 | 70.61 ± 2.68 | 67.94 ± 2.00 | t = 0.80, p = .425 |
| Perception threshold | 15.75 ± 0.82 | 16.33 ± 1.22 | 15.17 ± 1.11 | t = 0.71, p = .483 |
| Pain threshold | 39.21 ± 1.29 | 38.04 ± 1.90 | 40.34 ± 1.75 | t = 0.90, p = .375 |
Overview of sociodemographic and psychological variables as well neuropsychological attention test results obtained during screening procedure (A) and on study day (B). Psychological variables were assessed with the Hospital Anxiety and Depression Scale (HADS), State-Trait Anxiety Inventory (STAI) including only the trait subscale, Positive, and Negative Affective Schedule (PANAS) including positive and negative subscales and Pain-Related Self Statements Scale (PRSS) including subscales of pain catastrophizing and coping. Neuropsychological attention tests included the Trail Making Test (TMT) with versions A and B as well as the Stroop color word test (Stroop) with conditions word reading, color naming and the interference condition of color-word naming, all results given in seconds. During the individual rectal distention calibration procedure, perception, and pain thresholds were measured in mmHG. All values are given as mean ± standard error of the mean (M ± SEM). Differences between women and men were calculated by means of independent sample t-tests.