Table 1.
Sociodemographics of the Peer Relationships item bank sample for the main analyses and the relative efficiency analysis
| Sociodemographics | Main analysis sample (n = 527) | Relative efficiency analysisa (n = 483) |
|---|---|---|
| Age (years) | 13.59 (3.08) | 13.14 (2.81) |
| Gender | ||
| Female | 255 | 235 |
| Male | 272 | 248 |
| Ethnicity | ||
| Dutch | 436 | 402 |
| Non-western immigrants | 27 | 23 |
| Western immigrants | 64 | 58 |
| Educational level (parent) | ||
| Low | 72 | 64 |
| Middle | 255 | 229 |
| High | 200 | 190 |
aUsed for calculating relative efficiency between the PROMIS item bank, short form, CAT, and the PedsQL social functioning subscale. 18-year olds did not complete the PedsQL