Table 2.
Primary outcomes of feasibility and adherence
| Adherence and feasibility parameter | Low-dose aspirin (n=179) |
No aspirin (n=183) |
Screen and treat (n=184) |
| Ease of Doppler acquisition | |||
| Very easy | 8 (4%) | ||
| Easy | 53 (29%) | ||
| Fair | 61 (33%) | ||
| Difficult | 60 (32%) | ||
| Unobtainable | 3 (2%) | ||
| Days to PLGF/PAPP-A visit 1 | 7.6 (0–26) | ||
| PLGF/PAPP-A result>16 weeks | 5 (3%) | ||
| Time taken for visit 1 (minutes) | 60 (30–100) | 60 (25–90) | 60 (25–90) |
| Median adherence tablet counts | 96% | 95% (screen positive) | |
| Median adherence diary cards | 94% | 95% (screen positive) | |
| Non-adherent | 7 (4%) | 0 (0%) | |
PAPP-A, pregnancy-associated plasma protein-A; PLGF, placental-like growth factor.