Table 3.
Robson's 10-Group Classification of Flemish women giving birth in 1992-2000-2008-2016: relative size of each group in total birth (%).
| 1992 (%) | 2000 (%) | 2008 (%) | 2016 (%) | p value | |
|---|---|---|---|---|---|
| 1 | 27.1 | 25.1 | 27.2 | 26.6 | ∗ |
| 2a | 12 | 13.1 | 11.4 | 10.7 | ∗ |
| 2b | 1.2 | 1.4 | 1.5 | 1.1 | ∗ |
| 3 | ND | 27.2 | 27.4 | 29.2 | ∗ |
| 4a | ND | 14.6 | 11.7 | 10.7 | ∗ |
| 4b | ND | 1.0 | 0.7 | 1.1 | ∗ |
| 5 | ND | 5.6 | 7.9 | 8.4 | ∗ |
| 6 | 2.3 | 2.7 | 2.8 | 2.5 | ∗ |
| 7 | 1.7 | 1.8 | 1.8 | 1.7 | p = 0.12 |
| 8 | 1.6 | 1.8 | 1.9 | 1.8 | p = 0.07 |
| 9 | 0.3 | 0.3 | 0.3 | 0.3 | p = 0.02 |
| 10 | 4.1 | 5.4 | 5.5 | 5.8 | ∗ |
Robson 3, 4a, 4b, 5: p value comparison 2000-2008-2016. NA = no data. ∗p < 0.001.