Demographic details of mothers and infants included in the LOOZ-substudy compared with available Dutch data
| N | Study group | The Netherlands (2003) | p | |
|---|---|---|---|---|
| Mother's age (years; average) | 600 | 32.0 | 31.013 | <0.001 |
| Parity (%) | 600 | <0.02 | ||
| 1st | 42.0 | 47.113 | ||
| 2nd | 39.5 | 35.013 | ||
| 3rd | 14.4 | 12.513 | ||
| 4th or higher | 4.1 | 5.413 | ||
| Education (%) | 600 | <0.001 | ||
| Vocational training | 15.7 | 30.613 | ||
| Secondary education | 45.2 | 43.513 | ||
| Higher education | 37.3 | 21.613 | ||
| Unknown | 1.8 | 4.313 | ||
| Mother's country of birth (%) | 600 | <0.01 | ||
| The Netherlands | 91.5 | 81.613 | ||
| Europe | 4.2 | 10.013 | ||
| Outside Europe | 3.8 | 7.613 | ||
| Unknown | 0.5 | 0.813 | ||
| Sex | 552 | n.s. | ||
| Male | 51.2 | 51.414 | ||
| Female | 48.8 | 48.614 | ||
| Average birth weight (g) | 552 | |||
| Male | 3694 | 352513 | <0.01 | |
| Female | 3531 | 338913 | <0.01 | |
| Exclusive breastfeeding (%) | ||||
| 1 month | 65.1 | 54.015 | <0.01 | |
| 3 months | 44.4 | 32.915 | <0.01 | |
LOOZ, Landelijk Onderzoek naar Ontlasting bij Zuigelingen.