Table 4. PROMIS anxiety and depression Dutch reference valuesa by age and gender and comparisons with the US general population [58].
| Anxiety | Depression | ||||||
|---|---|---|---|---|---|---|---|
| N Dutch population (%) | N US population (%) | Dutch mean T- score (SD) | US mean T-score (SD) | N US population (%) | Dutch mean T-score (SD) | US mean T-score (SD) | |
| Total | 1002 (100) | 2724 (100) | 49.9 (10.1) | 50.0 (10.0) | 2160 (100) | 49.6 (10.0) | 50.0 (10.0) |
| Gender | |||||||
| Male | 480 (48) | 1069 (39) | 49.0 (10.0) | 48.6 (9.5) | 890 (41) | 48.8 (10.1) | 48.7 (9.7) |
| Female | 522 (52) | 1654 (61) | 50.6 (10.1) | 50.9 (10.2) | 1269 (59) | 50.4 (9.9) | 50.9 (10.1) |
| Age in years | |||||||
| 18–34 | 253 (25) | 659 (24) | 51.8 (9.9) | 52.4 (10.7) | 496 (23) | 52.0 (9.3) | 52.3 (10.9) |
| 35–44 | 147 (15) | 496 (18) | 51.4 (10.9) | 50.9 (11.1) | 366 (17) | 50.5 (10.8) | 50.6 (10.9) |
| 45–54 | 173 (17) | 417 (15) | 50.0 (10.9) | 50.1 (9.5) | 359 (17) | 50.0 (11.0) | 50.8 (10.0) |
| 55–64 | 216 (22) | 442 (16) | 48.9 (9.4) | 49.3 (9.5) | 373 (17) | 48.8 (9.8) | 49.5 (9.7) |
| 65–74 | 191 (19) | 365 (13) | 47.5 (9.1) | 48.1 (8.8) | 290 (13) | 47.0 (8.9) | 48.4 (8.8) |
| 75+ | 22 (2) | 345 (13) | 46.2 (9.4) | 46.9 (7.9) | 276 (13) | 46.0 (9.6) | 46.5 (7.2) |
SD: standard deviation
a T-scores, higher scores represent more anxiety/depression; T-scores were calculated based on the original US item parameters