Items description | Descriptives | Mokken scalability | GRM model fit | Range of item discrimination and difficulties* | Internal consistency | Measurement invariance | Cross cultural validity | |||||||||||||
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Mean (SD) | Range (Min–Max) | Skewness (SE) | Kurtosis (SE) | Hi (SE) | S-X2 | p | α | β1 | β2 | β3 | β4 | IIT | αIID | Sex | Age | Region | Educ. level | Ethnicity | ||
Global Mental Health | ||||||||||||||||||||
Global02: quality of life | 3.0 (0.9) | 1–5 | 0.08 (0.04) | − 0.17 (0.07) | 0.633 (0.009) | 94.550 |  < 0.001 | 3.507 | − 1.935 | − 0.603 | 0.710 | 1.893 | 0.72 | 0.76 | 0.0025 | 0.0065 | 0.0005 | 0.0014 | 0.0001 | 0.0041 |
Global04: mental health, including mood and ability to think | 3.1 (1.0) | 1–5 | 0.01 (0.04) | − 0.32 (0.07) | 0.654 (0.009) | 160.820 |  < 0.001 | 2.757 | − 2.047 | − 0.783 | 0.529 | 1.648 | 0.73 | 0.75 | 0.0007 | 0.0031 | 0.0001 | 0.0006 | 0.0011 | 0.0028 |
Global05: satisfaction with social activities and relationships | 3.0 (0.9) | 1–5 | 0.03 (0.04) | − 0.15 (0.07) | 0.603 (0.010) | 87.731 |  < 0.001 | 2.849 | − 1.855 | − 0.644 | 0.739 | 1.916 | 0.68 | 0.78 | 0.0017 | 0.0031 | 0.0003 | 0.0012 | 0.0018 | 0.0032 |
Global10: bothered by emotional problems | 3.7 (1.0) | 1–5 | − 0.31 (0.04) | − 0.64 (0.07) | 0.518 (0.012) | 323.387 |  < 0.001 | 1.321 | − 3.717 | − 1.779 | − 0.220 | 1.181 | 0.52 | 0.85 | 0.0070 | 0.0165 | 0.0017 | 0.0034 | 0.0020 | 0.0136 |
Global physical health | ||||||||||||||||||||
Global03: physical health | 2.7 (0.9) | 1–5 | 0.24 (0.04) | − 0.23 (0.07) | 0.565 (0.010) | 145.562 |  < 0.001 | 2.266 | − 1.792 | − 0.239 | 1.094 | 2.248 | 0.62 | 0.71 | 0.0010 | 0.0022 | 0.0019 | 0.0021 | 0.0041 | 0.0046 |
Global06: carry out every day physical activities | 4.1 (1.2) | 1–5 | − 0.91 (0.04) | − 0.32 (0.07) | 0.525 (0.013) | 184.359 |  < 0.001 | 1.943 | − 2.668 | − 1.619 | − 0.705 | − 0.055 | 0.55 | 0.74 | 0.0018 | 0.0013 | 0.0005 | 0.0030 | 0.0003 | 0.0006 |
Global07: pain on average | 3.1 (2.7) | 1–5 | 0.41 (0.04) | − 1.16 (0.07) | 0.547 (0.010) | 82.367 |  < 0.001 | 2.063 | − 3.641 | − 1.306 | − 0.279 | 0.916 | 0.62 | 0.71 | 0.0013 | 0.0047 | 0.0002 | 0.0013 | 0.0011 | 0.0048 |
Global08: fatigue on average | 3.4 (1.0) | 1–5 | − 0.16 (0.04) | − 0.50 (0.07) | 0.513 (0.011) | 64.189 |  < 0.001 | 1.705 | − 2.844 | − 1.291 | 0.144 | 1.548 | 0.56 | 0.74 | 0.0029 | 0.0458 | 0.0018 | 0.0049 | 0.0034 | 0.0002 |
Items not contributing to the subscale scores | ||||||||||||||||||||
Global01: general health | 2.8 (0.9) | 1–5 | 0.20 (0.04) | − 0.16 (0.07) | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |
Global09: usual social activities and roles | 3.0 (0.9) | 1–5 | 0.07 (0.04) | − 0.12 (0.07) | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |
Recommended values | N/A | N/A | N/A | N/A |  > 0.30 | N/A |  ≥ 0.001 |  > 1.0 | N/A | N/A | N/A | N/A |  ≥ 0.40 |  < α |  < 0.02 |  < 0.02 |  < 0.02 |  < 0.02 |  < 0.02 |  < 0.02 |