Table 1.
Descriptive statistics for baseline demographic and illness features for BD alone and BD ＋ PTSD
| Characteristics | BD alone (n = 125, 84.46%) | BD ＋ PTSD (n = 23, 15.54%) | Test-statistic | Effect size |
|---|---|---|---|---|
| Age | 46.4 ± 12.7 | 44.4 ± 9.5 | t(38.26) = −0.87, p = 0.38 | d = −0.16 |
| Female | 63.2 (79) | 73.9 (17) | χ2 = 0.97, p = 0.32 | V = 0.08 |
| Relationship status, married/defacto | 46.6 (62) | 21.7 (5) | χ2 = 6.08, p = 0.01 | V = 0.20 |
| Illness features | ||||
| Age of formal BD diagnosis | 35.4 ± 11.7 | 34.5 ± 9.3 | t(36.13) = −0.41, p = 0.68 | d = −0.08 |
| Self report duration of illness (in years) | 25.4 ± 12.2 | 25.5 ± 9.7 | t(36.54) = 0.05, p = 0.95 | d = 0.01 |
| Number of hospitalisations, median (IQR) | 1.0 (4) | 2.0 (5) | U = 1,164.50, Z = −0.78, p = 0.28 | r = 0.39 |
| Medication at baseline | ||||
| Antidepressant, yes | 54.4 (68) | 69.6 (16) | χ2 = 1.82, p = 0.17 | V = 0.11 |
| Mood stabiliser, yes | 72.0 (90) | 52.3 (12) | χ2 = 3.56, p = 0.05 | V = 0.15 |
| Antipsychotic, yes | 57.6 (72) | 65.2 (15) | χ2 = 0.46, p = 0.49 | V = 0.05 |
| Benzodiazepine, yes | 18.4 (23) | 26.1 (6) | χ2 = 0.72, p = 0.39 | V = 0.07 |
Values are presented as mean ± standard deviation or number (%).
PTSD, post traumatic stress disorder; BD, bipolar disorder; df, degrees of freedom.
t = ttest, χ2 = chi square, U = Mann−Whitney. Cramer’s V used to interpret chi-square effect size, Cohen’s dused to interpret ttest effect size and rwas used to interpret Mann−Whitney effect size. Adjusted df reported.