Table 2. Factor loadings and item characteristics of the QMI (N = 1431).
| No. | Original Item (German version) | PAF Factor I (N1 = 708) | Mean | SD | pi (%) | rit |
|---|---|---|---|---|---|---|
| 1 | We have a good relationship. (Wir haben eine gute Partnerschaft.) | .92 | 6.2 | .95 | 86.7 | .87 |
| 2 | My relationship with my partner is very stable. (Meine Beziehung mit meinem Partner ist sehr stabil.) | .92 | 6.2 | 1.1 | 87.3 | .87 |
| 3 | My relationship with my partner is strong. (Unsere Partnerschaft ist stark.) | .94 | 6.2 | 1.1 | 86.5 | .90 |
| 4 | My relationship with my partner makes me happy. (Meine Beziehung mit meinem Partner macht mich glücklich.) | .92 | 6.2 | 1.1 | 86.0 | .88 |
| 5 | I really feel like part of a team with my partner. (Ich fühle mich wirklich wie ein Teil eines Teams mit meinem Partner.) | .91 | 6.1 | 1.2 | 85.2 | .86 |
| 6 | All things considered, what degree of happiness best describes your relationship? (Wie glücklich schätzen Sie auf einer Skala von 1 = sehr unglücklich bis 10 = perfekt glücklich Ihre Partnerschaft–über alles betrachtet—ein?) | .78 | 8.2 | 1.8 | 80.2 | .72 |
Notes. QMI = Quality of Marriage Index; Mean of each item (range 1–7), PAF = principal axis factor analysis; SD = Standard deviation; pi = item difficulty; rit = corrected item-total correlation. Respondents answer the first five items on a 7-point scale ranging from 1 (strongly disagree) to 7 (strongly agree). The sixth item participants rate their overall level of happiness on a 10-point scale ranging from 1 (extremely low) to 10 (extremely high).
N1 = subsample I drawn by random case selection procedure using SPSS 24