Table 1. Characteristics of children included in the analysis overall and stratified by special healthcare needs. Values represent proportions of complete cases.
| Overall | Never SHCN | Ever SHCN | % missing | SMD | |
| n=751 | n=543 | n=147 | |||
| Female sex | 50 | 53 | 37 | 0 | 0.33 |
| Immigrant family | 7.9 | 7.3 | 5.7 | 4.0 | 0.062 |
| Multiple at birth | 2.4 | 2.6 | 2.1 | 0.3 | 0.035 |
| Breastfeeding | 2.4 | 0.083 | |||
| None | 11 | 11 | 13 | ||
| Up to 6 months | 39 | 40 | 37 | ||
| More than 6 months | 50 | 49 | 50 | ||
| Abitur (A-level exams), mother | 77 | 78 | 82 | 4.9 | 0.11 |
| Abitur (A-level exams), father | 74 | 77 | 69 | 6.4 | 0.18 |
| School location | 0 | 0.076 | |||
| District of Mainz-Bingen (rural) | 55 | 55 | 59 | ||
| City of Mainz (urban) | 45 | 45 | 41 |
SHCNspecial healthcare needsSMDstandardised mean difference