Table 1.
Characteristics of the mothers according to breastfeeding status concerning their youngest child: The NutriNet-Santé Study
| Characteristics of the women | Total population | Breastfed | Did not breastfeed | P |
|---|---|---|---|---|
| N | 29,953 | 20,153 | 9800 | |
| Age in years | 53.0 (52.8–53.1) | 51.3 (51.2–51.5) | 56.4 (56.2–56.6) | 0.001 |
| Age during the latest pregnancy | 30.0 (29.9–30.0) | 30.4 (30.3–30.5) | 29.1 (29.0–29.2) | 0.001 |
| Body mass index, kg/m2 | 23.8 (23.7–23.8) | 23.6 (23.5–23.6) | 24.2 (24.1–24.3) | 0.001 |
| Age categories, % | 0.001 | |||
| < 40 years | 19.3 | 23.3 | 11.0 | |
| 40–49.9 years | 19.9 | 21.1 | 17.4 | |
| 50–59.9 years | 27.1 | 27.0 | 27.1 | |
| 60 + years | 33.8 | 28.6 | 44.5 | |
| Educational level, % | 0.001 | |||
| < high school degree | 21.4 | 15.8 | 32.9 | |
| < 2y after high school degree | 15.9 | 14.0 | 19.9 | |
| ≥ 2y after high school degree | 62.7 | 70.2 | 47.2 | |
| Marital status, % | 0.001 | |||
| Single | 3.0 | 3.2 | 1.6 | |
| Married | 81.4 | 81.4 | 80.8 | |
| Divorced | 11.9 | 12.0 | 11.7 | |
| Widowed | 3.7 | 3.4 | 5.9 | |
| Smoking status, % | 0.001 | |||
| Never smokers | 51.3 | 51.6 | 50.7 | |
| Former smokers | 36.6 | 37.4 | 36.8 | |
| Current smokers | 13.1 | 11.0 | 12.5 | |
| Childbirth order, % | 0.001 | |||
| 1st child | 24.4 | 24.1 | 24.6 | |
| 2nd child | 47.0 | 46.0 | 49.8 | |
| 3rd child or more | 28.6 | 29.8 | 25.6 | |
| Decade of childbirth, % | 0.001 | |||
| < 1970 | 6.1 | 4.4 | 9.6 | |
| 1970–1979 | 19.6 | 15.9 | 27.3 | |
| 1980–1989 | 24.4 | 24.1 | 24.9 | |
| 1990–1999 | 19.7 | 19.8 | 19.5 | |
| 2000–2009 | 18.7 | 21.8 | 12.4 | |
| 2010–2016 | 11.5 | 14.0 | 6.3 | |
| Area of residencea, % | 0.001 | |||
| Parisian region | 18.7 | 19.1 | 18.0 | |
| Paris Basin | 14.8 | 13.4 | 15.6 | |
| North | 3.9 | 3.8 | 4.1 | |
| East | 8.0 | 8.6 | 6.7 | |
| West | 15.5 | 14.7 | 17.2 | |
| South-West | 11.6 | 11.2 | 12.3 | |
| Center-East | 14.8 | 15.6 | 13.2 | |
| Mediterranean | 12.7 | 12.6 | 12.9 | |
| Overseas Regions and Departments | 0.01 | 0.02 | 0.00 | |
aResearch and National Development Zones (ZEAT in French): Parisian region (Île-de-France), Paris Basin (Basse-Normandie, Bourgogne, Centre-Val de Loire, Champagne-Ardenne, Basse, Haute-Normandie et Picardie), North (Hauts-de-France), East (Alsace, Franche-Comté, Lorraine), West (Bretagne, Pays de la Loire, Poitou-Charentes), South-West (Aquitaine, Limousin, Midi-Pyrénées), Center-East (Auvergne, Rhône-Alpes), Mediterranean (Languedoc-Roussillon, Provence-Alpes-Côte d’Azur, Corse), Overseas Regions and Departments (Guadeloupe, Guyane, Martinique, Mayotte, La Réunion). https://www.insee.fr/fr/metadonnees/definition/c1910
Childbirth order is the birth order of the mothers’ last child
Data are mean (95% confidence intervals computed using the standard error of the mean) for continuous variables and percentages for categorical variables
P values are linear trends for quantitative variables and chi square for qualitative variables