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Difference of gestational age of screening when done in general practice compared with screening by midwives and at first hospital attendance.
| Practices | Hospitals | Midwifery clinics | |
|---|---|---|---|
| Number of cases analysed | 173 | 253 | 126 |
| Mean gestational age of screening (weeks) | 9.68 | 13.73 | 12.54 |
| Difference in means | n/a | 4.05 | 2.86 |
| 95% CI | n/a | 3.41 to 4.68 | 2.07 to 3.65 |
| P-value | n/a | <0.001 | <0.001 |
